Samox AM38J Crankset - 135mm 11-Speed 30t Direct Mount Samox JIS Square Taper Spindle Interface Spindle Bolts Sold Separate BLKSamox AM38J Crankset 135mm 11 Speed 30t Direct Mount Samox JIS Square Taper Spindle Interface Spindle Bolts Sold Separate Black. The Samox AM38J crankset is optimized for Junior MTB use and features forged aluminum crankarms that mate with a JIS Square Taper spindle (bottom bracket and spindle bolts are sold separately. Utilizes a forged steel narrow wide direct mount 3 Bolt chainring that offers chain retention and smooth pedaling. JIS Square Taper