Enduro's Zero Bearing Jockey wheels are the ultimate drivetrain upgrade for riders seeking maximum efficiency and weight reductions. 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 is 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.Avaialble for Shimano 9, 10, 11sp, Campagnolo 10 & 11sp, SRAM 9, 10, 11spHigh precision Delrin jockey wheelsEnduro Zero Ceramic BearingsWeight: 8.7g