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Vospertw
Posted on Sunday, August 29, 2010 - 12:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

All, replaced my first set of tires a couple of months ago. I have a fairly sensitive static balancer, and had a heck of a time getting a set of 2CT's to come in under the maximum wheel weight limit in the factory manual. However, they seem to run just fine, even at track speeds. I recently picked up a second set of rims for track days which didn't come with rotors/pulleys. That made me wonder - what is the best way to balance our tires? I left rotors and pulley on the last set but I'm wondering if part of my balancing problem was having a lot of "lateral" imbalance with only one rotor up front, and especially with the pulley on the rear. When I set this next set up, I will balance them several times (rim only, rim + tire only, rim/rotors/pulley + tire) to see what happens, but wondering what everyone else does? I've always left rotors on other bike wheels, but of course most have dual rotors up front, and most don't have anything as large as a pulley attached to the rear wheel. My thought on leaving everything attached was that it all added up to rotating mass, but maybe the lateral imbalance makes a difference? Thanks in advance.
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Vospertw
Posted on Monday, October 18, 2010 - 12:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

FYI - I recently changed the rear tire starting with a bare rim, no rotor/pulley. I balanced the rim itself, then the rim and pulley, then the rim/pulley/rotor, and finally the complete wheel/tire. The heavy spot did not move perceptibly from bare rim to rim/pulley/rotor. The only change was that it took 1/8 oz less weight to balance the complete rim than just the rim itself. Bottom line is that the pulley and rotor were very well balanced. And, when combined with a Dunlop Q2 (with the dot aligned with my measured heavy spot - which was slightly offset from the valve stem) the required weight dropped another 1/8 oz.
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Buell_bert
Posted on Tuesday, October 19, 2010 - 12:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I haven't balanced a car tire in quite a few years and back then we did static and then spin balancing later but it is interesting on what you have observed. Thanks.
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