The PROFILE Spider BMX 4 Bolt are super popular amongst racers.
-This bolt on style spider 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.
-Will only work on 19mm axles.