Enduro's Zero Bearing CX Jockey wheels are the ultimate Cyclo Cross drivetrain upgrade for riders seeking maximum efficiency. Zero Cermamic bearings use grade 3 ceramic (Silicon Nitride - Si3n4) balls which have tolerances are more than 2 times tighter than a standard ABEC 3 bearing. This high level of tolerance combined with the high precision Delrin jockey wheels is critical in iradicating float and bearing play ensuring an efficient and precise drivetrain. Minimal divets, grooves and holes in the jockey wheels and covers helps prevent mud and grass clogging. Avaialble for Shimano 9, 10, 11sp, SRAM 9, 10, 11spHigh precision Delrin jockey wheelsEnduro Zero Ceramic BearingsWeight: 20.4g