Spindle bearing spacer

92b said

They had a display set up at PRI in Indy. If you gave it a spin i'm pretty sure an hour later it would still be spinning. If 1200% is measured by comparing the number of revolutions I can believe it. How many places behind the decimal is that in hp or MPG? I don't know but I would guess a lot. One thing for sure is it takes a lot longer to set up initially than a conventional set up. However it is somewhat rewarding watching how freely it spins when your done. Even if it is .0000001 HP.

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Seems like a simple but time consuming (once) way to really dial in your preload and get it exactly where you want it. There's some neat products at PRI.

RustyRatRod said

Thing is, tapered roller bearings are designed to run with preload. This spacer removes the preload. Yall go ahead and run it. I'm good with my stuff like it is.

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For those who don't know what PRI stands for:
It's not a local parts store convention.

Racers have and do run low friction wheel bearings. Coatings, special greases, low friction seals, sometimes even oil instead of grease (works great). These are racers looking to win races and championships. They maintain and rebuild there stuff nearly every race if that's what it takes.

I also believe these spacers can be used in situations were the available spindle nut cage cotter key slots choices are not giving you an optimum preload. IE: one slot too loose, next too tight. Some people try different spindle nuts, spindle nut cages to get the preload they like.