Engineering Guide to Bike Wheel Balancing... Or anything that needs statically balancing
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- เผยแพร่เมื่อ 20 มี.ค. 2022
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This video was produced following feedback from a number of commenters. There is an associated webpage below which I am constantly adding to. It gives more detail and some of the nuances that I did not feel appropriate for TH-cam.
www.hambini.com/an-engineerin...
This is an Engineering guide to wheel balancing. It is practiced on a bike but it will apply to anything that requires static balancing. This video covers, force vectors, magnitude, rotational inertia, orbit speeds and phase lag/lead.
Website www.hambini.com
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You can support the channel by signing up for patreon here. It allows me to produce non biased technical reviews and content.
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Thanks, I decided to learn more about hairdressing
Keep this up and you could offer a course in bicycle engineering. I'd certainly take it.
Hambini time!!
If thats your car, please for god sake put the right size tyre on that rim. That was a rim that was to wide for that size tyre. Seems to be a 8 inch rim, with that specific tyre, the size is wrong, to much rim overhang. Rim placement in relation to the tyre beed placement directly effects sipe angle and scrubbing throung cornering.
god damn the things i could have done in life if hambini had been my teacher in high school.. you're doing a great thing sharing your knowledge hambini. thanks heaps from all your viewers
I may have taken a great interest in hair dressers if he was my teacher ;)
This was one of your best videos of all time! I loved the presentation. Clearly, you spent a lot of time putting this together and I thank you very much for that.
It did take me quite some time.
@@Hambini I hope it made you feel good to know that I and many others clearly noticed the results of your great effort and appreciated it very much. 👏👏👏
Thanks for info. I’ve used golf club weights. Their basically short pieces of lead tape in 1g increments. Initially I stick on the rim like you taped the bolt. Then if I’m happy I break the wheel down and put them inside the rim tape. You’ll never get it perfect but get as close as possible but don’t let “better be the enemy of good”. On the rear wheel to bypass the free hub ratchet I take the chain off or slide it off and hang carefully on the stay.
I use the same lead tape. But it's even easier to just take the wheel off and hold it from the QR 😀
I've done exactly the same. The tricky part is to adjust the weights after you've swapped tires.😁 I cut the led strips with scissors. Also mount the tire back the way it came off. If your tirres can mount in either direction (vittoria?) you're going to have to figure out which wasy it was.
Doesn’t putting it under the rim tape make it difficult to mount a tyre?
@@jimhize On the rim tape! Or you use veloplugs. The weights come in quite narrow strips that even for 26mm wide rims fit right between the tubeless ridges. (I don't personally ride tubeless (compatible) tires which are supposedly a tighter fit.)
@@jimhize on or under the rim tape. Although the weights have their own adhesive I like under to make sure they stay in place. The downside mentioned is if you change tire or tube you may need to adjust the tape.
Come for the sarcasm and PowerPoint roasts, stay for the next-level engineering analysis and detailing! One would suspect that more videos like this will push the bike biz to up its game with better product and marketing, but I don't think any such miracles will be forthcoming anytime soon.
Atleast we would become sound buyers
Great explanation on the difference between static and dynamic balancing, but also on the details on when it is needed. You are absolutely fantastic at explaining engineering principles; I have a physics degree and everything you explain is as good as any physics professor. Bravo.
Good stuff.
I counter balance my wheel with lead tape on the rim bed, under rim tape. There are plenty of space there between tire seat on modern wide wheels. Most lead tape or tungsten tape for tuning tennis racket works.
This won't impact aerodynamic and it's still easy to access (just under rim tape). As far as I see, it doesn't effect pumped up tire profile.
In the past, I tend to under correct my wheel. Thinking reducing the amplitude is good enough and it weight less to reduce amplitude than to fully eliminate it. But since watching this video, I might revisit my setup and try to get very close to fully balance, if possible.
That bolt is 10 times the weight I expected you would need. That is amazing really
yea. weird
I’ve been living with speed wobbles on and off since the 90s. This is a game changer, cheers professor! 🍻
Hot damn Hambini! Once again hitting it out of the park. Thanks man!
Oh and quite stoked that the pen is working quite well the past couple of days😂
This got me interested, so let's do some math from first principles: At 30 mph (48 kph), a weight at the edge of the wheel will experience (v^2/r) acceleration of ~50X gravity. So a 4 gram weight imbalance (Hambini's proposed limit) will "feel like" a ~6hz sinusoidal force with an amplitude of 200 grams, or a bit less than 1/2 a pound. One way to put this into context is to ask what size road bump that would 'feel like'. According to measurements in Silca's blog, a road bike tire has a load sensitivity of about 200 N/mm. Using these numbers, a 4g imbalance would feel the same as a ~0.01mm undulation in the road! (For context, that is about the size of a red blood cell and below the perceptual threshold of what you could feel with your hand in ideal conditions.)
So, at least in the vertical plane, imbalance is fine on a bike wheel. However, we have to consider the horizontal plane as well. That 200g force is shaking a ~8kg bike, which is going to lead to an (a=f/m) acceleration of 0.025 m/s^2 (by 1/omega^2 math). This isn't a lot, and it's going to create a 6hz vibration of ~0.02mm assuming the rider wasn't providing any impediment to motion. That's only 2x the vertical case, and still nothing.
Now all of this assumes no resonance. If the wheel imbalance was both undamped and operating near its resonant frequency (see video) then it could in theory produce large multiples of that displacement. But, I did the (w=sqrt(k/m)) math on a bunch of the subsystems and it's hard to see how resonance would be an issue at
@Dave As for the horizontal direction, the 8kg of the bike is only relevant for during the test, as Hambini was doing, with no rider on the bike. So yes, you see the bike shaking there quite a bit at high rpm (and that will happen with about any non-balanced wheel). Out on the road, of course you have to add the rider weight to that, so the effect will be about 10x lower then. Just saying/agreeing that wheel imbalance is typically not something to worry about, when the wheels are build (rim & spoke-ing) with any reasonable quality.
@@wouterdobbelaere yes follow thru to the end - the imbalance effect is more realized for lighter riders / I do balance my deep carbon rims (>40mm) using led tape if its slight and or epoxy a steel rod under the rim tape in the spoke hole
Good points there Dave. I agree. The movement is dependant on rider weight and tire softness also. But, add tubeless sealant to the mix and this miniscule vertical bobbing will probably dissapear as the fluid will disperse to cancel this. (at least when riding a perfectly flat surface that will never happen on the road)
its very detectable and at less than 30mph.
A great video, thanks Hambini! I hadn't realised how much vibration there can be due to wheel imbalance. I've just experimented with my tubeless wheels/tyres (30mm rear and 25mm front Goodyear Eagle F1 tubeless tyres on Zeal Camerigg 44 wheels) on an upturned bike; without any "balancing weights", spinning up the rear really had the bike moving. I've taped a small washer to the spoke-face of the rim opposite the valve, using gaffer-tape, the difference is amazing. I'm looking forward to trialling this on the road - if it's as good as I think it will be, I'll probably be able to use stick-on golf club weights to balance.
I really like bicycles and the content you offer is very interesting, sometimes because of my lack of knowledge in mathematics I don't understand, but I try to learn.. I'm from Brazil.. now it's 9 pm here and it's 30° C/86°F.. rain and cold is not the problem here.. I always prefer to ride at night because of the heat.. Thanks for teaching me such specific things about bikes..
Excellent video. Woh! Those Excel skills! I was expecting to see a Hambini fix at the end though, so I’ll give the 5 year old an 8/10.
Hambini , congrats on the quality of your work in your videos !
Great video, cheers Hambini. You can use a motorcycle wheel balancer on a bicycle wheel with a thru axle. The wheel balancer is basically a stand with 2 sets of bearings either side and you place an axle through the wheel and put it onto the bearings and spin, heaviest parts sits on the bottom. Works perfectly, more accurate than leaving wheel in frame.
Outstanding. Thank you again for explaining the engineering in a way my hairdresser would master. Blinding case of the obvious a wheel needs balancing and totally ignored. Makes me now wonder on manufacturing consistency between wheel sets of the same model.
Excellent info. As a junior, I balanced my wheels and my friends laughed at me. I didn't have any tools to demonstrate it was a good idea; it was just intuitive. I have been vindicated.
i love you hambini, a true artist
You are the The Workshop for bicycle world. Thank you for spitting facts
Glad to see you're coming around to review wheel balance. My offer still stands. Dan
Really dig the Hambini coveralls! I run tubeless hunt 30's and Reynolds arx 41's, I use the shortest valve stem possible and use black tungsten golf weight's and I balance them in hand with the thru axels which gets them really close. Just piece of mind when descending at speed, I no longer feel the wheel vibration.
Yep - I had a pair of FFWD Tyro Dark 45mm Carbon wheels. Ended up adding 9g to balance these. Used sticky 3gram golf club weights inside the tyre so all neatly hidden. Transformed the handling of the bike.
Job well done! Bravo!
Used it to balance my checkbook. Cheers!
Good work well done Engineer Hambini 👍
Impresionante explicación, muchas gracias!
Voy a hacer eso con las ruedas de mi bicicleta de carretera.
Great video on wheel balancing. Even I understood most of it.
Applied as suggested and this works great.
I used washers stacked up rather than a bolt, and a thick duck tape as I think an insulation tape will wear through on the road.
Great Hambini
Very timely topic, as I've just put some SKS Airspy sensors on the bike and needed to counter balance the 18g added.
Love it. Thanks for the education.. and entertainment 😀👍
I also wish i had a teacher, any teacher, who had cared about learning/teaching.. thankyou MISTER Hambini!
yes. me weekly dosage of pure engineering ! Thanks!
love the educational videos
Thanks for the Skillshare tip!
Love Your Ritchey Logic Light Steel bike!
Own a 1987 Bianchi Limited Ultegra 600 Down tube Shifters with 7 speeds, Rainbow Edition.
Rides fast in classic comfort!
Good stuff, thankyou
thanks for showing us COS vs SIN graphs!
Fascinating, great vid. My mark mark one chopper will be flying now😂.
OMG he is talking about this! I have deep carbon wheels with 60mm valve stems latex tubes. I bought a cheap photo speed gun and used a router motor to spin my wheels up to 35mph. There was a significant hop caused by the valve stem.
So on the opposite side I used a 1/2 ounce crimp on fishing weight. Now both wheels are as smooth as silk at and speed. I’ve noticed on my rides that it’s way smoother all around and holds a 20+mph speed easier .
I have a pair of wheels that I could feel where imbalanced when riding. It was very noticeable on the beautifully smooth roads in Majorca when coasting downhill. It was less noticeable when pedalling or on rougher roads. I never had this problem with aluminium rims, so I reasoned it might be that the carbon rims were so light that the extra weight of the valve stem had proportionally more effect. I balanced them by bending some lead flashing around the rim and taping it down with electricians tape. I span the wheels in the frame and put the weight in the 12 o'clock position directly opposite the point of the rim that stopped lowest. That was opposite the valve stem, as expected. I kept altering the weight until the wheel no longer stopped spinning with the valve at the 6 o'clock position. I also found I could feel balance/imbalance by taking the wheel out of the frame and spinning while holding the ends of the QR. It just about worked. A while later I beautified it by replacing the lead flashing with lead strips for balancing golf clubs.
Very well made. When is your next live Q&A ? I love those.
you can use something like bostik blu tack and put it on the outside of your wheel at height of your inner tube to determin the weight needed and finetune it until you have the correct weight &place. This way you won't need to take of you tire every time you need a correction. If it's balanced then replace it with the same weigth of golf club lead tape strip on the inside of the rim at the same place.
Hambini has grown up! 😃
branded overall - you've made it!
Note: the AUDI was just a random car he found outside and the police are looking for a 5yo in overalls for loitering and talking shit about other children’s manufacturing tolerances.
totally random!
Sounds great thanks one wheel is worse by a lot and it looks like it is the tire so I’ll change front to back tires only to check
Great videos Hambini!!! I love the Bottom Bracket I bought from you! How often should I repack the bearings on it, I always ride in clean dry conditions. Thanks. :)
I put some weighted beads in my motorcycle tires, they dynamically balance the tire, works really well. Could Sealant if your tubeless, kind of do the same thing I wonder? Have you heard of these dynamic balancing beads? It's basically just a bunch (of course you measure) of weighted (ball bearings if you will) that find the trueing spot once rotating. Thanks for your videos, always insightful!
nobody mastered the absolutely jarring hard cut to bright orange like Hambini. Up there with the bone/space transition of 2001 space odyssey, will be studied by film students for years
Yes!! I got a massive Speed Wobble at about 50 km/h from some very bad Newmen wheels on a Cube bike. The imbalance was huge and the bike was totally out of control and I nearly crashed. Sadly neither Newmen or Cube showed any interest in any possible faulty manufacturing. So typical.
Hmm .. I've never been bothered by 'road buzz' or vibration from my wheels. Im 75kg and do many fast descents 80kph+. I did always wonder why the bike vibrates on the stand when spinning up the rear wheel though. Cheers for the info!!
In regards to sealant and out of/in balance (which is always moving around), would you think it (the sealant) would try to act somewhat like the steel BALLS/ lead shot that is illustrated in this test? th-cam.com/video/Wq6f7hOlpx4/w-d-xo.html
Wow! That’s def interesting.
That is super interesting. A key difference between the example shown in that video and sealant in a bike tire is that the sealant is a fluid and therefore any tendency to accumulate at particular angular points (acting as a counter balance) would be, at least partially, counteracted by the centripetal force which acts to spread the sealant evenly around the tire.
It would definitely be worth doing an experiment on this #hambini
nothing like a bit of instruction and inspiration to kill a few hours with the bike, a roll of sticky-back lead tape and the kitchen scales 👏
If u have tubeless u can add the weight counterbalance under the tire Just like kushcore (inner tire foam).
That could help
After watching many Hambini videos: turn my volume down -> "hello Hambini fans!" ->then turn volume back up. Today: hmm something about Skillshare -> turn volume back up -> "HELLO, HAMBINI FANS!!!" :)
Very informative - thanks! Two questions though... should I wear safety goggles if I plan to exceed 37kph and will the tape affect the grip of the tyre?
Really enjoyed this video alot , always something new to learn when Hambini is at the pulpit . I have a question i was curious about and not sure it applies to bike wheels . Other then the static and dynamic balance you touched on what about road force , the interaction between the tire and the road . When we balance automobile wheels at our workplace we not only static and dynamic balance them but also road force and match mounting , for example you may not always have to add as much weight to balance wheels but rotate the tire . Bad tires i would imagine are as common in the bike industry as it is in the automobile sector . Not sure the later applies though because the mass of a car wheel exceeds the mass of a carbon wheel , your thoughts ?
Nice AB's jersey bro!!!
Spiffing explication. Again, I am shown how much I didn't known about yet another subject. Thanks, darling.
I liked the prior hair dresser, the Mr Spock hair cut 🤣👍
Hi Hambini. On a static balance do you know what average speed this would start effecting a rider ? I average 17 to 21 mph. I do rider faster when I’m trying to catch my hairdresser. Thankyou
Wonderful
really interesting actually
l'm getting new wheels and atm l ride pretty old mavic ksyriums ... weight is 60-65 kg but l've never had speed wobble or vibrations. gonna look out for that on my new carbon wheels tho
Does the sealant optimize its position to stabilize the wheels ? So Can it counter thé valve weight ?
I've just fitted a Shimano RS500 wheelset, they have a counterweight built into the rim opposite side to the valve which I thought was a nice touch. Rarely see that!
As always, f*cking awesome. Thanks.
Another informative video, where would go to have this done, is it a LBS job or more specific!
@hambini, on your 65 Hyper wheel imbalance, how many grams guesstimate did it take to get the balance about right?
I suppose running a tubeless set up, you could glue a flat weight on the inside of the rim?
home job would be sufficient. if you are on tubeless, you could glue it to the inside of the rim or put it under the rim tape.
I started balancing my rims about three years ago just to get rid of road buzz and don't ride anywhere near 37kph. 4gr does make a difference even if it's within an ISO acceptable value.
Cool stuff. I'm curious whether attaching a balance weight to a spoke would be a bad idea from the standpoint of stressing the spoke.
You’re a genius
Frenchie ! This better be good as I consider myself a wheel balancing expert.
Not bad. I myself use solder wire and wrap it around the spoke very tightly (and a spot of epoxy on the ends to secure it) to balance my wheels. I don't do it in one spot 180 degrees off the heavy spot though. I do it in two spots 120 degrees off the heavy. I also eliminate the ratchet at the rear for more acurate placement of the weights. The average ham & egg'er has no idea how out of balance their wheels are. I tell them to put the bike in a work stand and get a wheel spinning and see what happens. When they do they can't believe how much movement there is. Balancing also reduces stresses to the bike, not just the rider.
FTP
Finn
I thought removing the pawls/freewheel would make more sense.
pancho, I started balancing my wheels using my dad's plumbing solder as you described when I was a kid. It was very easy to balance a wheel by trial and error without knowing anything about the physics of the problem.
I have used lead tape for golf clubs on top of the rim tape under the tires a few years.
I think Hamibini age 5 has graduated to age 6 with those Excel chops!
no that's where you are wrong. He's always aged 5..
Very informative, thank you. Have you any advice on how/what to use to imbalance wheels ? I'd like to do something for my front Hed jet wheel.
you can use weights that you can buy in small packets from a golf shop, friend of mine just did this to his own wheels. he put them inside under the rim tape. they work great
@@paulhowell7103 nice tip, thanks !
Hi I've been balancing my wheels for years. Alu wheels are heaviest opposite the valve hole while carbon wheels are heaviest at the valve hole. To balance them I use thin lead strips, used for anchoring aquarium plants, underneath the rim tape. I leave the wheel very slightly out of balance so when installing the tube and tyre the wheel is brought back into balance.
What you were supposed to get out of this vidya was that you've been wasting your time and money for years.
@@AnttiBrax Hi Antti....... Not really. I've descended mountains at over 85 kph and the bike has felt super stable compared to unbalanced wheels.
Thanks Steve, was lookin for examples of real world application - not found above
Steve, I only have alu rims and steel ones and my experience is that they are always heavy at the valve hole (with innertube installed)
@@Paul58069 Hi Paul. Then it's the innertube causing that. Alu/Steel rims start straight then made into a hoop. The hoop is joined, pinned and welded which adds material and so weight. A valve hole is drilled opposite which removes material and decreases weight. I always balance my Alu wheels without tyres and tubes. I add lead strips either side of the valve hole , under the rim tape. I leave it slightly unbalanced because the extra weight of the innertube valve, and the valve lock ring brings it into balance.
Ironically is sent my Campagnolo Boras (tubs) back to Campagnolo Italy because they were the most out of balance set of wheels I’d ever ridden. Sadly the bike shop removed the tubs and cassette etc so consequently Campagnolo returned them with No Fault Found. It’s incredible that I’ve had to add so much weight to balance these rims, I might just as well have purchased a heavier set in the first place 🤷♂️
When are you going to start reviewing steel frames like Tomassini or Colnago. Have you any thoughts on those frames in general.
Hey Hambini! I have a silly question-apologies if not a smart one. Wouldn’t vertical “wheel truing” fix the imbalance in the rim, or is it more that you assume that is already done but wheel/tyre/tube combo adds another layer of imbalance? The latter-I get it.
I remember dicking around with balancing tubular wheels 45 years ago, and eventually deciding with my road-racing friends, that any effects were inconsequential. Haven't bothered, since.
can you cover rotating mass differences? I talked to a supposed physicist on reddit (he claimed to be) and he said a 200g difference is only a .4w difference from 0-40 kph. can you also further elaborate this and see if going from 40-30 kph for example, the heavier wheel ends up being better and you save more than lose that way? it would be an interesting video
Ohhh he's on the big ring! Let the intimidation begin !
My mountain bike's chain goes to a smaller cog when I pedal backwards or when I roll the bike back (and the freewheel moves the chain backwards). It can get bad enough that it wants to jam the chain because the derailleur wants to stay on the large gear. I was thinking of moving the rim to the left, so when the wheel is centred on the seat stay, the wheel is better aligned with the crankset. Does that make sense?
Phase lag is related to gyroscopic precession, where an input to a rotating object will see the output after 90 degrees
how balanced are bicycle tyres usually? is it worth rotating the tyre relative to the rim before trying to balance with weights?
Nice shirt! 👍👏👏
Is it a possibility to use bead weights inside tubes/tires? Wouldn’t they balance the wheels a bit better if there was more than one area out of balance? I know for some people this is ridiculous.
Oz Cycle did a good video on balancing your wheels a couple of years ago.
I wonder what the area under the graph is when you have a freewheel noise like that. The sound is like fingers down a chalkboard to me.
Great video!
The way I do mine is :
1. Start adding bluetack to the inside of the wheel, until the wheel stops wobbling.
2. Weight the total amount of bluetack
3. Get the weights used for golf ... errmm stick and match the weight of the bluetack
4. Stick the golf weight to the wheel
5. Cover it with a strong gaffer tape to make it as flat as possible.
The difference in the vibration is particularly noticeable when riding downhill on a very smooth surface.
I balance both shallow aluminium and deeper carbon wheels this way.
So what is the most recommended laymans solution? just lay down short strips of tape on the inside of the rim opp the heavy side with some small weight under the tape? Great video i didnt even know people balanced bicycle rims but I have Hypers also and when my bike is upside down and wheel spun as per ur demo it hops about also 😬
What if we will add the speed sensor on the hub, will that might give any change to the wheel balance?
My situation is a bit different. At 110kg, 140rpm going downhill on a track bike, the imbalance is mainly caused by the stones on the saddle!. The suspension is the rider. Forget the wheels, A balance shaft is needed to correct crank inertia forces. You can see the serpentine path of tires after riding through a puddle. Still balanced wheels can't hurt.
hi Hambini, how to check for lateral balance? my front wheel looks good but at higher speeds in descents Im getting the shimmy lateralbeffect, any thoughts on this? thanks!
great
Hi Hambini! I run tubeless which means 30g of stuff sloshing around at speed in a narrow road bike tyre... that sounds quite significant in the context of the 4g of balance. How would you take the liquid into account with this approach. And does it have a dampening effect bc it's a liquid..?
Good question.
Just my reasoning: The liquid will get dispersed inside the tyre. with more of it on the bottom due to gravity. The distribution of the liquid will remain fairly constant though, certianly at constant speeds. This means the liquid's center of mass is static with respect to the bike frame. Therefore, my guess would be the liquid has very little influence on the balance of the wheel,.
When i was a mechanic i have some doubts about where the líquid goes, i run some experiments, if u accelerate very Quick from dead stop the centrifugal force will keep the líquid in one Spot, but if u accelerate slowly the líquid will distribute more evenly
it will probably spread around the tire, how even it goes - nobody really knows as some of it ends up sealing small punctures
When I've done spin tests with sealant in my own tires, the imbalance is usually higher at first, and after a few seconds really drops off, indicating that the sealant always spins out and distributes around the tire.
Also, when I've had flat tires and done a quick tire removal, the sealant appears to be spread pretty evenly out, wetting all the interior surface.
Based on my observations I don't think there is much imbalance from sealant as it seems to distribute evenly from the variety of forces.
Hey there Hambini- Great video. I really get a lot from these educational ones.
You mention a potential loss of 12w on a bad day while Silca in their aero wheel weight marketing suggest a possible gain of 1w at 30kph.
Is this a matter of your figure being based in higher speed and imbalance or do you think there's some part of the situation they're missing? Maybe they're only counting hysteresis losses from tyre loads rather than frame/rider losses?
There is a bit more on it here and in much more detail www.hambini.com/an-engineering-guide-to-bicycle-wheel-balancing/
I guess the key thing to note here is I've used an official ISO standard, so it's recognized and has gone under fairly robust scrutiny. The silca methodology hasn't and I'm not saying it's wrong but there is no real technical scrutiny behind it. If you park all of that to one side, the other key point is the effect of resonance. That will have a dramatic impact on the power loss, if you ride the bike at a speed which causes resonance then the power loss will go up quite dramatically and that is what the chart shows. Typically resonant frequencies on a bike are at speeds above 35kph. and most of the time above 40km/h - hence the guidance for trigger speed to balance at 37ish KPH. If you are not riding at a resonant speed then the power loss will be only a few watts.
The majority of the power loss when the thing vibrates happens due to flexing of items, the flexing is an energy loss as you never get back what you put in. A sort of side effect is the impact it will have on the body, physiologically people will not put as much power down if the bike is vibrating. I hope that helps.
Thanks so much for taking the time to reply- I've gone through the extended doc and with your explanation here it makes a lot more sense. Very keen to have a crack at it as soon as possible.
As an aside I think a video explaining what effects lateral stiffness actually have on power loss at the rear wheel could be hugely valuable. I can't think of an area of bike design that attracts quite so much quackery (springy returning energy smoothing out dead spots in stroke, planing, whatever Jan Heine and co are into) yet has such a small amount of solid information/debunk/explanation of fundamentals out there. It's a real wasteland- if only there was a 5 year old with newly improved excel visualisation skills who could shine a light down for us plebs
An idea.
Cut out the valve out of an inner tube exactly the same as you would normally use. Remove as much inner tube from valve as possible, weigh valve and valve cap. Then get a screw or screws of the same weight or slightly higher that have slots in the body, put slot over spoke and tighten with bolt.
oh so silly question....is it rear wheel cos it's the drive wheel or does it happen to a lesser degree on the front wheel?