Balancing Racing Slicks

[tj310]

If you reindex a tire and it makes a difference you have a bad rim IMHO ---Trevor

[fordteacherguy]

Originally Posted by tj310

If you reindex a tire and it makes a difference you have a bad rim IMHO ---Trevor

There are few tires produced that have 0 run-out when they remove them from the casting molds and fewer rims as well. The problems become one of tolerance stack up...two component individually "in spec" that are assembled with individual tolerances aligned may be out of spec as a combined assembly. Todays balancers measure total rim run-out and tire run-out individually and indicate where you can match the assembly for the least run-out ..thereby running smoother and needing less weight to balance.

I was at automotive factory training and told that OEM wheels are intentionally made slightly out of round on purpose to allow tire indexing corrections for overall less total run-out than with a perfectly round rim.

[ATI Performance Products]

We spin balance ours, but we also run a radial tire on both cars. Some tires take a couple ounces on the Rear but we had to put 5 oz them before as well. No issues with vibration otherwise. We did run a Bias ply at one point this year and it did't vibrate at all. At 160 it did grow a little bit more than 5" though.