New updated design with Rubber expanding collet.
This version for Shimano™ Hollowtech II steel spindle road cranks only.Designed precisely to Shimano bearing stance & chain line spec.Forged & machined heat-treated 7075 T6 AluminumFor 68MM BB30/PF30 and older Specialized OSBB Road framesNot for BBRight, BB386EVO, BB30A, BB86, BB92 framesSteel version:Enduro 2437Ceramic Version:Enduro 2437 Angular contact, Grade5 balls, ABEC5 Assembly68mm version cannot be used for MTB Cranks