It could have been inadequate balance, or maybe tire construction. Tires flex and rebound, and this process can set up a vibration due to resonance in the carcass. Good tires are designed to absorb most of this, and are usually stable up to their rated maximum speed. Another reason racing tires are different.I don't think so. Do you remember the balance machines that would spin a tire/wheel while mounted on a car? I had one where the normal speed at the time of 55mph a balance was just fine. But when I got a lead foot and open road it would shake the heck of me at 120mph. So in the previous example of balancing high for a motor, does it too have a spot lower where things are not well balanced or is the above example I have just specific to that style of balance machine?
For MotoGP, Michelin does a static balance. you can see them working in the background of this video.I think we need to chat with a Ducati MotoGP mechanic, and ask him or her, how they balance their wheels. I am positive it will not be using a shaft, smaller than the hole in the bearings. Another issue with higher speeds is the tire losing shape, or coming apart. Barry Sheen at Daytona, had the tire expand and rub on the frame, and blow at around 180.
Isn't there a machine shop where you work with a lathe that you could turn a nice steel rod to replace that one?The weak spot of this device is the aluminum shaft, it's straight now but I'm sure it could be easily bent through rough handling, I treat it with kid gloves.
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this is important info from you: 4 bearings, each of them has friction.shaft sits on 4 very low friction ball bearings.
So I wasted my time doing an experiment, where I observed the inner race not turning.Rod diameter doesn't matter, because
1. wheel always turns around inner bearing race, not around rod of any diameter. (rope can be used instead of rod.)
2.Location of inner race will be always in lowest possible position (top of inner race on rod)
You are absolutely right!My balancing machine, has bearings that turn more freely than the bearings in the wheel
Because in the video from post #24 they are using a narrow 'axle' but.... You can see the tech slip a collar of some sort over the narrow axle that centers the assembly. (You can see that in the first 4 minuets). I'm thinking there could be low friction bearings in that collar and /or on the stand the narrow axle rests on.Rod diameter doesn't matter, because
Yeah but those machines will only run what, 200+ MPH...MotoGP team, not using the narrow axel system. I would suggest because they no better.
Oh yeah, I have some backup plans if I mess it up, we have plenty of toys at work to make things with.Isn't there a machine shop where you work with a lathe that you could turn a nice steel rod to replace that one?