The Profile Spline Drive spider is designed to provide optimal chainline when using a Profile Euro Outboard bottom bracket. Places the single chainring over the external bearing cup. Machined from a billet aluminum plate with a supplied Crmo steel adapter already pressed in to work with 48 spline spindles.

Three styles of single chainring spider available:
-4 Bolt (104MM BCD) for 19mm splined axle
-4 Bolt (104MM BCD) for 22mm splined axle
-5 Bolt (110MM BCD) for 19mm splined axle

Weight:
4-Bolt: 74g/2.6oz
5-Bolt: 83g/2.9oz