68mm for Shimano Road Cranks_x000D_73mm for Shimano MTB Cranks_x000D_
Ok...so you have BB30 PF30* (Please See Notes in Spec) or a Specialized OSBB frame but you need to run a Shimano crank?_x000D_
No worries. Our Praxis Works Conversion Bottom Bracket is just what you're looking for. Made to fit in either BB30 or PF30 frame the conversion BB is designed to be rock solid for a Shimano** Hollowtech II crank to be installed in your frame.