Praxis works Practice Conversion Specialised OSBB 61.5 mm 2010-2014 to Campy UT.

The Praxis Works Conversion Bottom Bracket is not an adapter, but a complete and high-quality bottom bracket designed to mount Shimano, SRAM GXP, or Campagnolo Ultra Torque cranksets in a BB30, PF30, or Specialized OSBB frame. The patented design positions the industrial bearings outside the bottom bracket, resulting in a stiffer system that does not struggle with frame tolerances like other systems.

Installation is incredibly simple: you press the longer cup onto the non-drive side into the frame and then screw on the cup on the drive side. The patented Praxis Collet System expands the Conversion Bottom Bracket to a precisely defined limit and compresses it with even pressure in the frame. There is no chance of the bearings working loose or sitting crooked in the frame. Additionally, there is a compressible O-ring under the collar of the non-drive side to accommodate frame width tolerances.

Thus, the likelihood of experiencing creaking or other annoying noises in the bottom bracket area during hard pedaling is virtually zero. Combined with high-quality Enduro Bearings, the Praxis Works Bottom Bracket is the best conversion bottom bracket solution.