MATERIAL: CNC machined in the U.S.A. from 6061 aluminum.
USE: Works with most 3-pc chromoly cranks and 48 splined 19mm spindles (made with offset for outboard bottom bracket - Profile). Allows you to use 4-Bolt chainrings.
SIZE: 104mm bolt pattern for 4-bolt chainrings.
NOTE: Spline-Drive Spiders slide directly onto 48 splined 19mm spindles and do not require a gear bolt to attach to crank arm.