Rotor BB1 Road Italian ABEC3 for 24mm Variant:Rotor Bottom Bracket BB1 Road Italian 70mm steel for 24mm Cranks black The DELTA standard requires a The DELTA standard requires a rotational mouvement of the foot toward the outside or inside for disengagement this system works together to reduce fatigue and strain You think that your bike's performance features could be enhanced with components selected á la carte at your local bike shop — and that you should be able to accomplish this despite the spawn of deviant bottom bracket "standards" that have created component compatibility issues ROTOR conceived its Universal Bottom Bracket (UBB) concept to eliminate the complicated bottom bracket crank compatibility challenge that has increasingly frustrated the mechanics at your LBS