Praxis M30 BB30/PF30 Bottom Bracket - Road & MTB Praxis M30 BB for installing a Praxis M30 Road crank into 68mm BB30/PF30 or older Specialized OSBB road frame also Praxis M30 MTN crank into 73mm BB30/PF30 MTN frame. Praxis M30 68MM Conv BB30/PR30 Bottom Brackets Features For Praxis M30 Spindle based cranks only. Not for other 30mm cranks. For Praxis M30 Spindle based MTN cranks only. Not for other 30mm cranks. For 68mm BB30,  PF30 or older Specialized OSBB road frames For 73mm BB30,  PF30 MTN frames Forged & machined heat-treated AL Cups 30mm Drive bearing /28mm NonDrive bearing |  Steel bearings Praxis M30 BB tool required for installation