Spindle must be purchased separately. Use FD140* - An evolution of the original, now exceeding the ISO Race standard - Low profile crank arm reduces pedal strike during technical climbs - Compatible with SRAM 3-bolt direct mount chainring interface - Q Factor: 167mm for 52mm Boost (176mm for Super Boost+) - Now features a matte finish - 5 year warranty - Weight: 610g (165mm length with 29mm spindle) TECH SPECS Model R-Spec Trail Enduro Length 160mm Direct Mount/BCD 3-Bolt Configuration 1x Spindle Interface 5Dev Material Aluminum Color Raw Silver