Praxis M30 bottom bracket - BB30 and PF30 73mm MTB. Suitable for Praxis M30 spindle to be installed on a frame with BB30 or PF30 interface. The rubber expander allows the BB to be more tightly secured in the frame. Suitable for 73mm installation width (MTB). Inner diameter of drive-side bearing is 30mm, inner diameter of non-drive-side bearing is 28mm. Place the wave washer on the drive side. Contains quality Enduro brand bearings. Aluminum cups. Please note: a special Praxis BB tool must be used for the installation of this BB.