2.5pc design featuring a proprietary internal wedge system in each arm to ease installation and removal, rectangular shaped heat-treated chromoly crank arms with 1pc spindle/sprocket bosses and a 48 spline 22mm hollow chromoly spindle with a single hollow flush mount spindle bolt. Right or left hand drive compatible.

Specs:

Style: 2.5pc
Spindle: 22mm, 48 Spinle Hollow Chromoly
Arms: 4130 Chromoly