This Conversion BB is for installing a Shimano Hollowtech II steel spindle crank in either BB30/PF30 road frame or older Specialized OSBB road frame.  This bottom bracket is made of lightweight and durable aluminum with long lasting sealed cartridge bearings.

• 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 Aluminum
• For 68MM BB30/PF30 and older Specialized OSBB Road frames
• Not for BBRight, BB386EVO, BB30A, BB86, BB92 frames
• Steel version:Enduro 2437
• Ceramic Version:Enduro 2437 Angular contact, Grade5 balls, ABEC5 Assembly
• 68mm version cannot be used for MTB Cranks