38mm - Duroc 40

as opposed to CrMo rails on the standard version

better sealing against contamination and is forward and backward compatible

Compatible with dropper seat posts

RAPIDFIRE PLUS

Enduro CO 6803 17mm x 26mm x 5mm Hub Bearing - 17mm - 26mm - 5mm - ABEC-5 Ceramic Radial Bearing - Black Oxide PLP|EMTB Optimised 38mm - Duroc 40CO 6803 VV Enduro Zero, Black Oxide, Ceramic Hybrid, ABEC 5, radial bearing (C3 clearance) 17 x 26 x 5mm Enduro Zero, Ceramic Hybrid, ABEC 5, radial bearing featuring black oxide treated 52100 High Carbon Chromium alloy races paired with Grade 5 Silicon Nitride Ceramic Balls with 90% fill, high pressure, water proof grease. Si3N4 ceramic balls reduce bearing wear and increase bearing life by eliminating steel on steel contact within the bearing. Black