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with weight loss ,i believe the greater the distance from the axis of a rotating part , the more benefit. meaning, weight removal at the tire will make more difference than an equal amount at the spool, brakes or axles.

So it could be possible that the tire weight is part of the reason were having a slow to rev problem in high gear between 6500 & 7000 rpm with the 34lbs heavyer tire ?



It is true that the farther out the weight is the
more it hurts. Possibly you are just running out of
torque to move the weight that far out