Have Ollywood explain how the little gnomes change your cycling glass lenses from clear to smoke and back so quickly. I recently sold all my cycling glasses and got one frame to match the road bike. Tifosi Crit with Fototec lenses.
Are bikes the most energy efficient methods of personal transportation? Energy efficiency of different transportation methods and why science multiple testing of hypothesis show confounding factors produce varied conclusions. Walk vs bike vs motorcycle vs passenger cars vs rail.
Ollie is an excellent instructor, very informative, thanks. I would like to see Ollie explore the fatigue life of frame materials, i.e. how long they will theoretically last, especially carbon. And as an aside the environmental impact of each. Cheers
I was about to skip this video because I did not expect it to provide much new information, but when I recognized that Ollie would present, I watched it just fof the fun of it - and I wasn't disappointed! Ollie is a great science presenter, not only regarding the hard (and dire) science, but in particular regarding his style. Chapeau!
A better explanation of hysteresis is that the tire has internal friction(between individual particles and the different layers) and so losses are introduced. This means that the tires will not output all the power that is put into them as some of the power went into deformation of the tire and the return of energy after that is not perfect.
@@svenweihusen57 yes. They sounded like they have no idea what hysteresis is. My dumbed down description is that it is the work required to flex the tire. Since the tire and tube are continuously being flexed when rolling, this matters. Generally, a lighter tire can be flexed more easily and will require less work to roll.
Hysteresis is also a major contributor to tire grip, especially during breaking, since it's also about energy dissipation (just at a different frequency compared to rolling)...also the differentiation between grip and adhesion feels...artificial...cured rubber doesn't "stick" to the road due to adhesion as described...for some very specific UHP racing compounds there is a bit of that, but not on bike tires, as that sticking would ruin rolling resistance as well as mileage of the tire
Quite informative. If I hadn't watched this, I'd have never learned Mr. Spock had such a significant contribution to tyre engineering. Thank you (to both Mr Spock and the GCN crew).
As a former car racer, the best advice I can give is to experiment with tires and keep notes. Try different tires, at different pressures, with different tubes.
Very informative Video and mostly correct! 😉 I'm working in rubber tribology (friction, wear and lubrication; seals not tires), and I can tell you that specifying any coefficient of friction (cof) to the second digit is nonsense. Variation is usually rather high, because friction depends on a million things. Dry rubber friction can be anywhere between 0.5 and 1.5, in extreme cases over 2! Yes, bigger than 1 thanks to adhesion. Most likely the cof will be between 0.7 and 1 in dry conditions, but only around 0.2 with oil... Also, smoother roads will result in more grip but less rolling resistance because the contact area between tire and road increases and there is less deformation.
Thanks to Ollie and GCN, I now have a better understanding of this topic. I always wondered why my gravel bike performed better on the dirt roads than on the tarmac. Also, I thought just more tire pressure meant faster rides. Now I am totally educated and more informed. Ollie really shines in these types of videos.
Thanks Ollie, very nice. The relevant ‘friction’ in biking is not ‘sliding friction’ as in the examples you gave of skis or ice skates and such - a bike tire does not slide on the road. The energy loss in cycling is mainly from the deformation of the tire as it makes a static contact with the road surface.
Their presentation was kind of fuzzy. Sliding friction is good when we want to go around a corner or push the bike forward by pedalling. Big friction coefficients are good...we call it grip. But most people hear "friction" and think it is bad. Hysteresis and deformation are indeed the big issues and they got it wrong.
Tyre compound I.E.- durometer reading. Stiff I.E.- sidewall suppleness. Jan Heine has covered all of this, going back at least a decade, more if I recall. Applied Forces at work. 'The linear tyre model' The degrees of slip is known as the cornering stiffness of the tyre. The model describes a linear relationship between the tyres slip angle and the lateral force produced. 2 wheeled vehicle dynamics. #kinematics
thanks for this-I had wondered whether the topic of TPI and how that affects tyre performance would be covered and would appreciate a short piece including this some time. Great work. Glad Alex survived too
How about a deep dive in wheels next? How does lateral, radial and torsional stiffness work compared to rim depth, spoke patterns and spoke tension? Straight vs j-bend spokes? Axel standards and so on.
It's crazy how much a tyre can make a difference to the feel and speed of a bike. I just swapped out the Giant Gavia tyres that came with my bike for some Goodyear Eagle F1, and wow, the grip and rolling resistance is night and day.
How so? Did grip go up and rolling resistance go down? It would have been good of Ollie to directly talk about how these two things relate to one another. He did so separately and the conclusion one would make from the video is grip and rolling resistance rise together or fall together.
You mentioned most high end tires are directional and that’s been my observation too. If you should make a “Part Deux”, you should show an animation of water shedding with the chevrons going the right way and the wrong way
Quite honestly, and to my surprise, I found this to be one of the most informative and entertaining GCN videos I've seen. Having dispensed with the sincerity, I would hasten to add my appreciation for your acknowledgement of my native language, American (Yank, if you're a Brit.) While you avoided "bidon," or "bidet" if you're French or pretentious, you did cover both "eraser" and "asphalt." This made me feel downright Continental and a bit exotic. I was saddened that you skipped right over "indoor trainer" for "turbo," "zero-point..." for "nought-point...," and "hydroplaning" for "aquaplaning." Your use of the terms "slippy" and "knobbly" just made me laugh, and I thank you for that. Finally, are you completely sure the zinc oxide isn't added just for protection against the harsh British sun?
I use natural rubber non-vulcanised tyres on one bike and I find the tread last more miles than the synthetic vulcanised rubber tyres on another bike. My hypothesis is that natural rubber (latex) can stretch to 6 times it's resting dimensions, while synthetic rubber stretches less. When the tyre experiences shear stress in cornering and acceleration, if it cannot stretch it will reach its limit and break. Thus, synthetic rubbers wear quicker.
You're missing the #1 most important aspect of performance -- supple sidewalls. Suggest that you check out all the real-world research by Jan Heine at Rene Herse.
Honestly surprised we didn't get xrf, tensile strength, raman, and ir spectroscopy data of different tire types Ollie, along with some bonus Scanning Electron Microscopy photos. :)
I’m doing a 200km ride next week. Should I swap out ny 700x35 knobby tires to a 700x32 smooth tires on a 80% smooth surface and 20% rough surface? My 35 knobby are tubeless.
KEVLAR vs ARAMID? Here is an interesting fact why I think Aramid & Kevlar are really the same. For over 25 years I developed bike tires for top tire manufacturers. One time I was working with the art department designing a tire logo and I requested it should say Kevlar on the tire and on the package. To my surprise they turned me down saying every time they use the "KEVLAR" logo, they have to pay DuPont (who owns Kevlar), a hefty royalty fee. So, they suggested to use the word "ARAMID" instead, which in the bike tire world all know it's Kevlar. FYI: Again, I don't know for sure this is a fact, but I do know we were using genuine DuPont KEVLAR as these huge rolls and bundles were all over the factory with their official logos. For a while I was a bit angered at DuPont for price gauging having to pay royalties on their KEVLAR logo even though we were using genuine DuPont Kevlar. Go Figure...
@@Bungle2010 If you read carefully, I was just working for the company, and those above me made the decisions, not I... This was common practice throughout the bike tire industry for quite some time. Also bike tire companies work on a super low profit margins and paying the royalty would have added about 1/3 more into the retail price. Besides these bike tire manufacturers purchase Kevlar in massive amounts paying Dupont hundreds of thousands of dollars. So, it's infuriating for Dupont to ask for more money if you want to tell the tire customer that their tires feature Genuine DuPont Kevlar... So there, who's screwing who?
So Ollie, what you are saying is that to stop my dog slipping and sliding on the wood floors, is to put boots on him that have a very sticky compound. My worry then is will he stop in time, or plow into the door?
Ollie, An analysis of crank arm length with efficiency and power comparing flats and hills. Also the efficiency of different types of chain oils with the scientific explanation of the oils under different conditions. Thanks, The Crazy Hat Chemist
Years ago , riders would buy tubulars and keep them for a period of time, somewhere dark, away from light, to mature the rubber tread. These days we just buy them and use them straight away. Is that because the rubber is different these days?
As always, nice video. I had an issue with the aramid fiber one that made the rim looked as if it was bended, but it was the tire with the issue and not the rim, could the tire be fixed?
Agreed. Mountain bike tires seem big and chunky, less grippy, but more lugs. Road bike tires are slimmer, grippier (or maybe that’s just mine), and more smooth. In theory, completely bald tires may be slightly faster? Aero anyways.
#askgcntech: Great info on composition. Is there a max ratio of rim size to tire width? My wife has 622x14 rims with 700x25c, so 25:14 or 1.8:1 Could she go to 28c, or 2:1? Composition, size and pressure are the triangle of tires.
I was surprised not to hear about the aerodynamic impact of the tyre threads on the power requirements to move the bike at 40km/h. Maybe I missed something.
Speaking of which, about tyres: when are we getting radial tyres for non leaning three or four wheeled pedal vehicles? Nowadays there are lots of trikes out there, which would benefit a lot of radial tyres. With cars every one use radial tyres today, because they are just better than diagonal tyres. Radial tyres have less rolling resistance so therefore they would make our velomobiles faster than with standard tyres. Anyone please, Schwalbe, Continental, Michelin, radial tyres in 28-406 and 28-559 sizes. Thanks.
Does hiking out as on a sailboat and keeping the bicycle closer to vertical around tight corners increase traction? Racing motorcycles do it and their tires have extreme shoulders.
Thank you. A couple weeks back GCN said it was fine if tires were installed backwards in their # ask GTN segment. They got some push back in the comments. Thanks for this video: obviously there's a lot of confusion, even at the pro level.
According to Schwalbe it matters only for off-road tyres with some tyres being mounted in opposite directions on the front and the rear. For road and touring tyres the direction is mostly aesthetic, some tyres are even symmetrical and are the same in both directions.
@@Ihwaz13 some are: mine aren't! They have a designed rotation to channel water out of the contact area: mount them backwards and they push water INTO the contact area and you WILL eventually crash! Not all tires have an arrow on the side wall, but if it does have an arrow, you need to respect it!
@@wilfdarr Schwalbe tested it and the speed necessary to get aquaplaning with a bicycle is over 200kph which I highly doubt most people encounter. The reason they tell you mount the tyres that way is because the grooves point forward on top of the tyre making it look more "dynamic". I suggest checking out their FAQ section for tread. That being said installing them as recommended by the manufacturer will definitely have no adverse effect and I mounted my tyres that direction as well even though I use them on the road 80%of the time.
@@Ihwaz13 Hydroplane, no, but enough water to cause a loss of traction, absolutely! I was experiencing significant traction interruptions just the other day on the local bike path (rubberized concrete): now how would that have gone for me if my tires were on backwards?!
@@Ihwaz13 Finally, if you have a road tread on a mountain bike or cruiser mounted backwards, it's not going to clear mud from your tread: water is only a mild problem compared to the lack of traction that a tire full of mud on a paved street is going to present! It's not “to look more dynamic”
I am noob bike rider and I use hybrid bicycle for fitness. My small request for GCN is please expand to other regions please make content that is understandable to viewers from other region. There are lots of cycling enthusiastic people in India but awareness is less. Please don't take this wrong way.
“And that's the reason we have summer tyres and winter tyres”. And here I thought we had summer tires because metal ice studs are $#!+ on dry pavement! 🤪
![[Live สด] การออกรางวัลสลากกินแบ่งรัฐบาล งวดวันที่ 16 พฤศจิกายน 2567](http://i.ytimg.com/vi/wPd7VFfWHIA/mqdefault.jpg)
What other cycling science would you like to see Ollie explain next?
White tires comparison?
Have Ollywood explain how the little gnomes change your cycling glass lenses from clear to smoke and back so quickly. I recently sold all my cycling glasses and got one frame to match the road bike. Tifosi Crit with Fototec lenses.
Are bikes the most energy efficient methods of personal transportation? Energy efficiency of different transportation methods and why science multiple testing of hypothesis show confounding factors produce varied conclusions. Walk vs bike vs motorcycle vs passenger cars vs rail.
I'd like to see him explain his terrible American accent. "A razor"? 😂
How not to get dropped! Lol
Nobody cracks me up like Ollie. The writers and delivery was perfect in this one. Lol. Great info too.
glad you enjoyed it
More science please! I love the explanations of why things work the way they work. I need this information in my life!
Thanks Cyndy - glad you liked it!
Ollie is an excellent instructor, very informative, thanks. I would like to see Ollie explore the fatigue life of frame materials, i.e. how long they will theoretically last, especially carbon. And as an aside the environmental impact of each. Cheers
Thanks Gary!
This was way more fascinating than I expected. Great video!
thanks pal!
Thanks Eric!
I was about to skip this video because I did not expect it to provide much new information, but when I recognized that Ollie would present, I watched it just fof the fun of it - and I wasn't disappointed! Ollie is a great science presenter, not only regarding the hard (and dire) science, but in particular regarding his style. Chapeau!
i would've loved to hear more about longitudinal compliance and the interaction with the inner tube.
A better explanation of hysteresis is that the tire has internal friction(between individual particles and the different layers) and so losses are introduced. This means that the tires will not output all the power that is put into them as some of the power went into deformation of the tire and the return of energy after that is not perfect.
You saved me writing it 👍
It's not better but the correct description. IMHO their description was simply wrong.
@@svenweihusen57 yes. They sounded like they have no idea what hysteresis is. My dumbed down description is that it is the work required to flex the tire. Since the tire and tube are continuously being flexed when rolling, this matters. Generally, a lighter tire can be flexed more easily and will require less work to roll.
Hysteresis is also a major contributor to tire grip, especially during breaking, since it's also about energy dissipation (just at a different frequency compared to rolling)...also the differentiation between grip and adhesion feels...artificial...cured rubber doesn't "stick" to the road due to adhesion as described...for some very specific UHP racing compounds there is a bit of that, but not on bike tires, as that sticking would ruin rolling resistance as well as mileage of the tire
Quite informative. If I hadn't watched this, I'd have never learned Mr. Spock had such a significant contribution to tyre engineering. Thank you (to both Mr Spock and the GCN crew).
OB is a fantastic presenter. Nice one
That’s Dr. OB to you
Thanks Jonty!
As a former car racer, the best advice I can give is to experiment with tires and keep notes. Try different tires, at different pressures, with different tubes.
Very informative Video and mostly correct! 😉 I'm working in rubber tribology (friction, wear and lubrication; seals not tires), and I can tell you that specifying any coefficient of friction (cof) to the second digit is nonsense. Variation is usually rather high, because friction depends on a million things. Dry rubber friction can be anywhere between 0.5 and 1.5, in extreme cases over 2! Yes, bigger than 1 thanks to adhesion. Most likely the cof will be between 0.7 and 1 in dry conditions, but only around 0.2 with oil...
Also, smoother roads will result in more grip but less rolling resistance because the contact area between tire and road increases and there is less deformation.
I actually laughed out loud with the bulletproof tyre scene! 😂 You two crack me up!
Great to hear!
"If you need some fresh threads to cover your carcass" caught me off guard 🤣
He came up with that segue all by himself too!
That was a great video, please more of this!
Also, props to the editing and graphics for the great work.
Thanks Thomas - glad you enjoyed it! 👍
Thanks to Ollie and GCN, I now have a better understanding of this topic. I always wondered why my gravel bike performed better on the dirt roads than on the tarmac. Also, I thought just more tire pressure meant faster rides. Now I am totally educated and more informed. Ollie really shines in these types of videos.
Cheers Steve! Happy to hear that the video helped!
Ollie Bridgewood - you're awesome. Love your enthusiasm. That is all.
Glad you enjoyed the video!
Thanks Ollie, very nice. The relevant ‘friction’ in biking is not ‘sliding friction’ as in the examples you gave of skis or ice skates and such - a bike tire does not slide on the road. The energy loss in cycling is mainly from the deformation of the tire as it makes a static contact with the road surface.
Their presentation was kind of fuzzy. Sliding friction is good when we want to go around a corner or push the bike forward by pedalling. Big friction coefficients are good...we call it grip. But most people hear "friction" and think it is bad. Hysteresis and deformation are indeed the big issues and they got it wrong.
Much more entertaining than it should have been. Chapeau Dr OB!
Thanks Tom!
"unwanted deformation of the knobbly bits" is the best description ever of that property.
Thanks for dispelling the ever-present "hydroplaning" myth!
We do have some tarmac here in the states, but it is limited to automotive drag race tracks and airport runways.
Thank you, Dr. Oliver Bridgewood 👨🎓
Tyre compound I.E.- durometer reading. Stiff I.E.- sidewall suppleness. Jan Heine has covered all of this, going back at least a decade, more if I recall.
Applied Forces at work.
'The linear tyre model'
The degrees of slip is known as the cornering stiffness of the tyre. The model describes a linear relationship between the tyres slip angle and the lateral force produced.
2 wheeled vehicle dynamics.
#kinematics
thanks for this-I had wondered whether the topic of TPI and how that affects tyre performance would be covered and would appreciate a short piece including this some time. Great work. Glad Alex survived too
Thanks Patrick, it is a really interesting topic!
Great video! The Kevlar-bullet proof bit, cracked me up!
Nice use of ‘carcass’ to smoothly segue to the GCN shop.
Brilliant absolutely brilliant, funny informative and so well delivered by Ollie the bullet proof bit cracked me up 👍
Ollie’s gun holding face at 2.04 - it’s like he’s preparing to star in a Netflix serial killer documentary about himself.
Coming soon on GCN Tech.... 😂
How about a deep dive in wheels next? How does lateral, radial and torsional stiffness work compared to rim depth, spoke patterns and spoke tension? Straight vs j-bend spokes? Axel standards and so on.
Good job, way to make what could have been a boring topic fun interesting and fun. Went perfect with my morning cup of coffee.
Thanks Dennis - glad to hear you enjoyed the video!
It's crazy how much a tyre can make a difference to the feel and speed of a bike. I just swapped out the Giant Gavia tyres that came with my bike for some Goodyear Eagle F1, and wow, the grip and rolling resistance is night and day.
Same here. I replaced my Gavia Fondo 1 for Vitorrio Corso Graphene 2.0 and the bike now just flies along
Oh that's my problem! 😉
How so? Did grip go up and rolling resistance go down? It would have been good of Ollie to directly talk about how these two things relate to one another. He did so separately and the conclusion one would make from the video is grip and rolling resistance rise together or fall together.
By far the best GCN video from the modern era!
Real science on GCN Tech! Dr Ollie did a great job here! What a great presenter, his delivery is spot on. Chappo on script writers!
Thanks! 👍
Every minute of this video was interesting. Thanks
Thank you!! 👍
Couldn't help but chuckle at "knobly bits". Monty Python flashbacks aside, very informative video and hilarious delivery from Ollie. 👍
I loved that explanation.. and learnt a new word "sipe". Awesome Ollie... (no comma between awesome and Ollie :) )
Some interesting stuff there. Not convinced that mentioning hysteresis (A lagging of one of two related phenomena behind the other) was helpful though
Thank you Dr Bridgewood - that's a great explainer. Yours, Dr David Hartin Mb, BCh, BAO, FRCEM
My wife just asked why I was grinning like a loon... top work Dr. Oliver Bridgewood
You mentioned most high end tires are directional and that’s been my observation too. If you should make a “Part Deux”, you should show an animation of water shedding with the chevrons going the right way and the wrong way
I love these segments. Helps me explain to the wife why I can’t go cheap on things. LOL
Quite honestly, and to my surprise, I found this to be one of the most informative and entertaining GCN videos I've seen. Having dispensed with the sincerity, I would hasten to add my appreciation for your acknowledgement of my native language, American (Yank, if you're a Brit.) While you avoided "bidon," or "bidet" if you're French or pretentious, you did cover both "eraser" and "asphalt." This made me feel downright Continental and a bit exotic. I was saddened that you skipped right over "indoor trainer" for "turbo," "zero-point..." for "nought-point...," and "hydroplaning" for "aquaplaning." Your use of the terms "slippy" and "knobbly" just made me laugh, and I thank you for that. Finally, are you completely sure the zinc oxide isn't added just for protection against the harsh British sun?
hahaha
Thank you Prof. Bridgewood!
I use natural rubber non-vulcanised tyres on one bike and I find the tread last more miles than the synthetic vulcanised rubber tyres on another bike. My hypothesis is that natural rubber (latex) can stretch to 6 times it's resting dimensions, while synthetic rubber stretches less. When the tyre experiences shear stress in cornering and acceleration, if it cannot stretch it will reach its limit and break. Thus, synthetic rubbers wear quicker.
nice! well written, delivered and illustrated.
Thanks Jay!
Excellent and informative video! Well done.
Thanks Rick - glad you enjoyed it!
I'm going out to buy tires today. Talk about a timely video!
You're missing the #1 most important aspect of performance -- supple sidewalls. Suggest that you check out all the real-world research by Jan Heine at Rene Herse.
Thanks for the translations haha but you forgot that in US we say "hydroplaning"!
More science stuff please - highly interesting! Professor Ollie rules!
Noted - he is certainly in his element in these science videos!
Live long and prosper Olly
Wow, unusually good editing, humor and also info!
SIPE! Said with enthusiasm.
Thank you, very interesting and useful.
Honestly surprised we didn't get xrf, tensile strength, raman, and ir spectroscopy data of different tire types Ollie, along with some bonus Scanning Electron Microscopy photos. :)
I’m doing a 200km ride next week. Should I swap out ny 700x35 knobby tires to a 700x32 smooth tires on a 80% smooth surface and 20% rough surface? My 35 knobby are tubeless.
Ollie in full geek mode…love it!
That's DOCTOR Oliver Bridgewood, to you!
@@gcntech 😂😂😂 fab!!! What’s next Doc ?? 😜
KEVLAR vs ARAMID? Here is an interesting fact why I think Aramid & Kevlar are really the same. For over 25 years I developed bike tires for top tire manufacturers. One time I was working with the art department designing a tire logo and I requested it should say Kevlar on the tire and on the package. To my surprise they turned me down saying every time they use the "KEVLAR" logo, they have to pay DuPont (who owns Kevlar), a hefty royalty fee. So, they suggested to use the word "ARAMID" instead, which in the bike tire world all know it's Kevlar. FYI: Again, I don't know for sure this is a fact, but I do know we were using genuine DuPont KEVLAR as these huge rolls and bundles were all over the factory with their official logos. For a while I was a bit angered at DuPont for price gauging having to pay royalties on their KEVLAR logo even though we were using genuine DuPont Kevlar. Go Figure...
You wanted to use their brand to promote your product. Why shouldn't they be entitled to a cut?
@@Bungle2010 If you read carefully, I was just working for the company, and those above me made the decisions, not I... This was common practice throughout the bike tire industry for quite some time. Also bike tire companies work on a super low profit margins and paying the royalty would have added about 1/3 more into the retail price. Besides these bike tire manufacturers purchase Kevlar in massive amounts paying Dupont hundreds of thousands of dollars. So, it's infuriating for Dupont to ask for more money if you want to tell the tire customer that their tires feature Genuine DuPont Kevlar... So there, who's screwing who?
Dr. Ollie and science? Liked automatically.
My schwalbe marathons arrived about an hour ago. I have high expectations, i dont mind the odd puncture but i dont want frequent ones.
Very educational - 👍🏼👍🏼
Very good info and presentation
Thanks Matt!
So Ollie, what you are saying is that to stop my dog slipping and sliding on the wood floors, is to put boots on him that have a very sticky compound. My worry then is will he stop in time, or plow into the door?
Stumbled upon this one, Great video
Ollie,
An analysis of crank arm length with efficiency and power comparing flats and hills.
Also the efficiency of different types of chain oils with the scientific explanation of the oils under different conditions.
Thanks,
The Crazy Hat Chemist
Years ago , riders would buy tubulars and keep them for a period of time, somewhere dark, away from light, to mature the rubber tread. These days we just buy them and use them straight away. Is that because the rubber is different these days?
A great techno analysis. Thanks
Ollie rocks
Maybe the Best GCN Tech show.
Bail/crash science. Laydown vs endo or clipless vs flats or bear hug vs side eject or hand catch vs shoulder contact ....
Well done Ollie!
I find Continental GP5000 clinchers quite excellent. Worth their weight in platinum.
As always, nice video. I had an issue with the aramid fiber one that made the rim looked as if it was bended, but it was the tire with the issue and not the rim, could the tire be fixed?
Thanks Ollie...Peace
Agreed. Mountain bike tires seem big and chunky, less grippy, but more lugs. Road bike tires are slimmer, grippier (or maybe that’s just mine), and more smooth. In theory, completely bald tires may be slightly faster? Aero anyways.
Great job, Ollie.
Really useful, thanks Ollie
Really cool Ollie
Another nice vid form GCN, but the number of ads is so annoying that I did left before the end.
I'm concerned where suggestion boy came from and went before making suggestions 😳🤣
Great video :) And good info.
Can I use 28 mm tyres with tubes on my 2012 Reynolds 800 mm deep rims? I currently am using 25 mm and would prefer the larger tyres.
Worth watching.
Doctor Bridgewood!
Dude I wanna believe in your tips but... I can't. I just can't accept any advice from the "most dropped" member of GCN. I love you Ollie.
Learned a lot! Thnx
Great job!
#askgcntech: Great info on composition. Is there a max ratio of rim size to tire width? My wife has 622x14 rims with 700x25c, so 25:14 or 1.8:1 Could she go to 28c, or 2:1? Composition, size and pressure are the triangle of tires.
I like Ollie has borrowed the Adam Buxton sign off. Very interesting vid
3:18 is a revelation! I never knew Charles Goodyear was an alien, let alone a Vulcan.
I was surprised not to hear about the aerodynamic impact of the tyre threads on the power requirements to move the bike at 40km/h. Maybe I missed something.
Speaking of which, about tyres: when are we getting radial tyres for non leaning three or four wheeled pedal vehicles? Nowadays there are lots of trikes out there, which would benefit a lot of radial tyres. With cars every one use radial tyres today, because they are just better than diagonal tyres. Radial tyres have less rolling resistance so therefore they would make our velomobiles faster than with standard tyres. Anyone please, Schwalbe, Continental, Michelin, radial tyres in 28-406 and 28-559 sizes. Thanks.
Nice, now we're cooking!!
Now let's talk about hoop stress Dr Ollie:)
Enjoyed that.
Thanks, John!
Is there a review of the GP 5000S TR in the pipeline?
doubt it, channel is sponsored by Pirelli
Yeah, thats right. But they also presented it when it was launched.
better to just check online on different sites, specially some whose purpose is to evidence the pro and cons of a tyre (tire)
We don't do reviews on GCN. Alex did do a first look video a few months ago though - th-cam.com/video/YJkmuPilYCE/w-d-xo.html
Does hiking out as on a sailboat and keeping the bicycle closer to vertical around tight corners increase traction? Racing motorcycles do it and their tires have extreme shoulders.
Thank you. A couple weeks back GCN said it was fine if tires were installed backwards in their # ask GTN segment. They got some push back in the comments. Thanks for this video: obviously there's a lot of confusion, even at the pro level.
According to Schwalbe it matters only for off-road tyres with some tyres being mounted in opposite directions on the front and the rear. For road and touring tyres the direction is mostly aesthetic, some tyres are even symmetrical and are the same in both directions.
@@Ihwaz13 some are: mine aren't! They have a designed rotation to channel water out of the contact area: mount them backwards and they push water INTO the contact area and you WILL eventually crash!
Not all tires have an arrow on the side wall, but if it does have an arrow, you need to respect it!
@@wilfdarr Schwalbe tested it and the speed necessary to get aquaplaning with a bicycle is over 200kph which I highly doubt most people encounter. The reason they tell you mount the tyres that way is because the grooves point forward on top of the tyre making it look more "dynamic".
I suggest checking out their FAQ section for tread.
That being said installing them as recommended by the manufacturer will definitely have no adverse effect and I mounted my tyres that direction as well even though I use them on the road 80%of the time.
@@Ihwaz13 Hydroplane, no, but enough water to cause a loss of traction, absolutely! I was experiencing significant traction interruptions just the other day on the local bike path (rubberized concrete): now how would that have gone for me if my tires were on backwards?!
@@Ihwaz13 Finally, if you have a road tread on a mountain bike or cruiser mounted backwards, it's not going to clear mud from your tread: water is only a mild problem compared to the lack of traction that a tire full of mud on a paved street is going to present! It's not “to look more dynamic”
I am noob bike rider and I use hybrid bicycle for fitness. My small request for GCN is please expand to other regions please make content that is understandable to viewers from other region. There are lots of cycling enthusiastic people in India but awareness is less. Please don't take this wrong way.
“And that's the reason we have summer tyres and winter tyres”.
And here I thought we had summer tires because metal ice studs are $#!+ on dry pavement! 🤪
Awesome. What is the name of the mini Air pump at minute 8:20??
It’s not a pump. It’s a Topeak tyre gauge.