SRAM XX1 & X01. Independently tested and winningcompetitions for the least rolling resistance,the truly best part of these jockey wheels isthe silent and crisp shifting they afford.Machined from solid Delrin at our Californiamachine shop, not molded, they are much harderand precise than any competitor's that havecopied this design. Where aluminum jockey wheelsare loud and deteriorate almost immediatelyafter installing, Enduro Bearings jockey wheelswill shift perfectly and precisely a year or twofrom now just the same as the day you installedthem.
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