The Profile Bolt-On Spider (Single Chainring) is for use with Profile Racing 3-Piece Race Chromoly Crankset with a standard sprocket bolt and 19mm (.75) BB axles. Chainring can be mounted on inner or outer face of spider for chainline adjustability. Works best with the Profile Internal Bearing Euro BB, American BB, MID BB, or Spanish BB.

***Only works with 19mm spindles***

Two styles of single chainring spiders available:
-4 Bolt (104MM BCD) for 19mm axle
-5 Bolt (110MM BCD) for 19mm axle

Weight:
4-Bolt: 65g/2.27oz
5-Bolt: 71g/2.48oz