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 SRAM DUM (73mm BB) chainline 52mm material aluminum color black