14 tyre questions answered - plies, 3psi, age, pressures, high/low profiles, directionals and more!
ฝัง
- เผยแพร่เมื่อ 27 ก.ค. 2024
- #toyotires
In this webinar I talk to Steve Burke, technical manager for Toyo Tyres Australia. Here's what we cover about tyres:
00:00 introduction
01:37 what are plies and why are they important for 4x4 tyres, what are the pros and cons
09:39 the modern all-terrain vs mud-terrain
10:34 what pressures should be set for onroad everyday driving for a standard roadcar?
12:10 is the 3psi rule accurate? does it work for motorsport too?
15:45 pros and cons and high and low profile tyres?
18:41 will Toyo continue to do semi-slicks like R888s in Australia? (a COVID story)
19:41 how old is "too old" for a tyre?
22:44 what's the difference between cheap and expensive tyres?
25:16 do directional tyres have a significant advantage?
26:40 what are the pros/cons of symmetric vs asymmetric tyres?
27:35 what's the difference between hub and stud mounted balancing?
30:50 what's the most common myth about tyres?
32:37 are space-savers (TUSTs) really 80/80 rated?
34:59 how far can you drive on a run-flat tyre?
Post questions as comments!
Follow me on Facebook:
/ robertpepperjourno
Support me on Patreon:
/ l2sfbc
Buy my books:
l2sfbc.com/where-to-buy/ - ยานยนต์และพาหนะ
![เบิ้ล ปทุมราช - อ้ายกินดอง น้องลาบงัว ft. สแน็ก อัจฉรีย์ [OFFICIAL MV]](http://i.ytimg.com/vi/-OK--KaSPcI/mqdefault.jpg)
Thank you for organising this presentation Rob and thank you to Steve for participating whilst taking a neutral perspective considering his association with Toyo. Well done gents. Cheers
Thanks! Yes, I pick my guests so they don't push a product. The smart ones realise that their expertise does the selling, not saying how great a product is.
Excellent session.
Glad you enjoyed it! Please share :-)
One other aspect regarding the speed and distance limitations on the space-saver tyre may be due to the additional heat generated in the tyre itself and also the drivetrain (where the differential has to adjust between the wheels constantly rather than the occasional adjustment as a result of turning). It seems similar to the old towing guidelines which are also concerned with heat in unpowered transmissions when in normal operation the oil circulation in the transmission is what keeps the temperatures to normal levels. Keeping the speed low and putting a cap on the distance per trip would hopefully prevent the temerature getting too hot; let the systems cool a little before going further in the compromised state.
That's a really good point, TUSTs are usually a little smaller diameter. And, lower speed means the reduced braking/handling isn't as much of a problem.
Great practical advice. Thank you gentlemen.
Glad it was helpful! Please share :-)
Another great vid keep more coming like this. Very interesting and informative.
Thanks, please share would appreciate that!
Brilliant video, very informative!
Glad it was helpful! Please share :-)
Old bloke owns a bunch of trailers for his earthmoving equipment, and one thing that he was 100% adamant about was protecting the tyres with silicone spray, the entire tyres including the grooved area,
I gotta say. He never reported a blow out or any issues with his tyres. I questioned him on the silicone spray being dangerous and causing loss of traction, but as he demonstrated with the duel axle trailer. The first turn he took pretty much scrubbed it off the tread
Seems logical, apparently silicones spray is meant to protect and prolong the playability and stress on the tyre as it doesn’t dry out and crack etc
What are your thoughts on this?
Look at my wide/narrow tyre video it explains two types of grip and why the spray doesn't affect the one which is the grip used in this scenario.
@@L2SFBC I’ll have a look, thanks 👍
Very good Robert, thanks
Thanks for listening, please share!
A great video that debunks a lot of incorrect information about tyres, particularly off-road tyres.
I have a very specific question for Toyo: Are Toyo planning to bring back our beloved M608z 285/70r19.5s light truck tyres at some point? It was a sad day for many in the 4WD light truck community when Toyo pulled out of the light truck market here.
I'm collating the questions and will ask Steve!
Very good information and presentation! Wish you more views and more likes👍
Thanks....you can help please share 🙏
@@L2SFBC Done.
Another thought I've had....
Your mate described the difference between 2 and 3 ply tyres.....
Why are my new Toyo 35" muddies classed as 10 ply?
Got a link?
@@L2SFBC toyotires.s3-ap-southeast-2.amazonaws.com/public/brochures/Toyo%20Tires_Open%20Country%20MT-Product%20Specifications.pdf
Ply rating in the chart on page 8 varies between 6 and 10 for the various tyre sizes listed. I don't know how that relates to the 2 and 3 ply infor???
He's describing the difference in the number of plies in the sidewall. You are talking about the ply rating (known as load range on some LT tyres) in terms of its load carrying capability.
Very informative gents.
What legally constitutes tyre damage that renders the tyre un-roadworthy? I'm talking about patching a tyre in the bush - a hole in the tyre wall vs a hole in the tread. Gashes and cuts, understandably cannot be repaired safely, but holes from say a nail or a stone that is easily repaired with a tyre kit -does the tyre always need to be replaced?
Repairs in the sidewall are an instant writeoff. Repairs in the tread area are generally ok. Then there is carcass damage eg sidewall bulges...that's a writeoff too.
What about truck weight 5000kg that 4x4 Isuzu crew cab types best use mix ground all times from hard ground or soft ground?
Thank you for sharing details video as great watching every time
Yes weight can count against the trucks, but it's not as much of a problem as you may think.
A few other questions and comments:
What is Steves’ opinion about balancing beads for 4WD tyres? I’ve had good success with beads especially in heavy tyres and rims, particularly noting the difficulties identified on the interview with balancing machines and heavy wheels. Also what type of balancing beads or powder esp for 4WD tyres. I’ve been using s/s beads as these don’t seem to block my valve cores when using rapid deflators that unscrew the core. But he would have the advantage of a much wider perspective on this.
What is Steve’s view on the best overall point to replace tyres. Typically I’ve found once they get to about 20% legal tread still left, I should replace them for a whole range of reasons. Would he concur or not?
Steve’s view on TPMS and whether monitoring internal tyre temperature is more important that pressure (per se) when aired down for situations requiring high flotation.
Also his views on frequency of tyre rotation. Again with big tyres, and especially luggy (MT) and high profile/sidewall tyres, I’ve found cupping often is an issue and I need to rotate every 5,000 km to get something like even tyre wear.
A good interview overall but it annoys me that manufacturers put out so little technically useful information about their products esp regarding pressure-load and also airing down recommendations. It was a pleasant surprise to see Toyo even allowing this interview to go ahead.
Excellent questions and I think I'll ask Steve back for a follow-up and do these. Yes I pick my guests carefully for technical knowledge, and NOT to just push products. It is hard to find such people, and also often the tech people are protected by layers of media people.
You may also enjoy my interviews with the Aussie LC300 engineers on LC300 development.
A note on tyre replacement; the legal limit is 1.6mm tread depth, but any AT or MT with say 15mm new tread depth is useless beyond about 2/3 wear, so change ahead of time.
@@L2SFBC Watched all your interviews on the LC300 development and again a credit to you and also to Toyota (or perhaps your powers of persuasion!) for making technical people available for that type of interview.
Some other comments I'd be interested in from Steve: He mentioned that tyre life is very dependent, mostly, on "how hard" a life the tyre has and in particular, how much load it carries compared to its load index. I've generally tried to buy Load rating E tyres ("10 ply") where available and also a load index (kg) such that I have a margin of at least 10% between what the tyre will be loaded to and its actual load index. I only need a low speed index for my vehicles. What is his view on 8 or 10 ply tyres, LT tyres generally, and also his opinion on deliberately buying tyres with a higher load index than needed in terms of longevity, durability and resistance to punctures and other types of track damage (e.g. the sidewall blisters or bubbles he was referring to). I would question his concern about heavier tyres using more fuel. That is no doubt true but in the overall scheme of running a 4WD especially in an overlanding mode, that extra cost is entirely miniscule and greatly outweighed by the importance of having "no problem tyres". Finally, what is his opinion on tyre plugs or carrying an inner tube as an emergency repair for a badly damaged sidewall. I realise he will be constrained in what he can say, but worth the question.
MIght need to get him to do a special session for my Patreons!!!
great info. it would be interesting to know if a tyre is damaged if sitting for a long time on a very uneven surface, like sitting on a levelling ramp, ( think caravan etc) with 'bumps' that deform the tyre, rather than a uniform surface?
Good question! It can take a little while after driving off for the tyre to get back to round if the tyre is soft and has been left a long time, but it's not normally any cause for concern.
I would have another question to Toyo. Why are my Toyo Open Country AT Plus (265/70 R15 DOT 2021 9mm thread) trying to kill me on wet roads. The tire is not even agressive, but still wont grip in the wet. Even my BFG KM3 were better.
Good webinar thanks. I like the 20% rule.
Glad it was helpful!
I've recently changed my tyres....from 37 I changed Nitto Ridge Grapplers.....to 35 inch Toyo Open Country MT.
I've reused the 8oz of tyre beads in each tyre in lieu of lead weights.
This is only 5 tonne gvm Chev Silverado a day I will NEVER use external weights again.
It's a shame this aspect of wheel balancing wasn't discussed.
These beads are marvellous and mean that the tyre won't be out of balance, even when it is caked in mud etc on one side.
Sorry about the auto correct typos.
maybe next time!
Wow Robert for a data driven guy this video really surprised me. A big deal was made about 3 ply sidewalls being so much more expensive and so much worse on fuel economy as to possible equal another set of tires. It's just not true. My best sources show that it's about 0.1-0.2% different for 10lbs added per tire. Over 50k miles for example assuming 20mpg your talking about 64 gallons of fuel. Roughly 300 dollars over the life of the tires. It would only take preventing one side wall puncture to make that well worth it. I just didn't get your normal thorough thoughtful data driven opinions. Still useful but not at the level of expectation you've set...I know it's a back handed compliment but I truly respect your insightful analysis but not on this one. Most of the content I agree with tires can't be one size/type fits all but I've been with plenty of friend's with their 2 ply sidewall end their trip because they only had one spare and weren't able to patch the sidewall gash. Twice it was a Toyo ironically enough. Never seen a KO2 or Baja Boss A/t with sidewall punctures. My experience overall is obviously limited which is why I turn to experts such as yourself :)
Well, I don't have data so relied upon the Toyo expert who I had no reason to disbelieve otherwise I wouldn't have asked him for an interview. I'm happy to see data from tests and correct the record. I've managed to puncture everything....but not for the last few years!