68mm for Shimano Road Cranks 73mm for Shimano MTB Cranks Ok…so you have BB30, PF30* (Please See Notes in Spec), or a Specialized OSBB frame, but you need to run a Shimano crank? 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.

SKU# PXS-68-3002R