- The Spline Drive Spider for Outboard BB's is designed to improve your chainline. It places the chainring over the bearing and cup itself, so that the chainline is closer to the centerline of the bicycle.

-Designed for use with 2 or 3 chainrings(104/64) and a Profile External(outboard) Euro bottom bracket.

-CNC machined from 6061 aluminum with a steel spline insert.

4 Bolt (104/64 BCD) for 19mm splined axle

Weight: 74g/2.6oz