The Samox AF26 crankset is optimized for MTB use and features forged aluminum crankarms that mate with a JIS Square Taper spindle (bottom bracket and spindle bolts are sold separately. JIS Square Taper Spindle interface (Bottom bracket and spindle bolts sold separately) Designed for use with 9/10-Speed drivetrains Rigid and lightweight forged aluminum crankarms 44t outer chainring is stamped aluminum for weight savings 32t middle and 22t inner chainrings are stamped steel for durabity and long life 104/64 BCD 4-Bolt chainrings 50mm chainline achieved with 118mm spindle length