In contrast to the Gen3 carbon cranks, the Q Factor, overall profile, and volume of our Gen4 cranks has been greatly reduced. e*spec cranks have an 8mm self-extractor built in to both arms for easy removal of press-fit versions. PRODUCT SPEC Chainring e*spec Direct Mount Chainring Color Stealth Black w/Protective Vinyl Compatibility Brose S Mag also compatible with Fazua and TQ Motors NOT compatible with Fazua Ride 60 with ETOR spindle Features World Cup proven layup. Slim Q factor, overall profile, and volume. 8mm self-extractor in each arm. Included Crankset, APS Adjuster, Installation Tools, Crank Boots (x2), Sticker, User Manual Length 165mm Material World-Cup DH-rated layup and construction, compacted carbon fiber, with additional 3k added to front and rear faces of crank for impact resistance Self Extractor Yes Spindle INTERFACE: Brose S Mag Weight Brose S Mag Fazua 165mm: 324g