Praxis Shimano Conversion Bottom Bracket Details
Praxis' conversion bottom bracket provides a strong and reliable platform to run your favorite cranks, on your BB30 or Presfit 30 (PF30) frame. The strength of this conversion BB lies in
its threaded design. The non-drive side cup is press fit into the frame providing an interface similar to other
bottom bracket conversions on the market. Where the Praxis design differs is in its use of a threaded drive side
cup. Using a Shimano BB tool the drive side threads into the non-drive side sleeve. The last millimeter, or so, of
threads expand the non-drive shell creating a stronger friction hold than a simple press fit bottom bracket could.
Furthermore the threaded design perfectly aligns the BB in your frame and prevents any walking out or wobbling of
the bearings under load.
These bottom brackets also offer a simple way to eliminate pesky creaks often associated with the pressfit BB interface.
Shimano 24mm Compatibility
All Bottom Brackets with the Shimano 24mm compatibility work with all cranks that use the 24mm standard. A few years ago this was close to the only standard for outboard bearing bottom brackets. Today most companies still produce cranks using this standard. Raceface, FSA, SRAM, Truvativ, Rotor and, of course, Shimano are some of companies that have produced under this standard.
Campagnolo UltraTorque Compatability
Between the two Campagnolo UltraTorque conversion bottom brackets you have all you need to convert BB30, PF30 or Specialized OSBB frames to use with the UltraTorque cranks. All Campy bottom brackets feature the same features that made the original Shimano Conversions so popular.
The Praxis Bottom Bracket Conversions marked PF30/BB30 come with a sleeve to fit PF30 frames. The sleeve will need to be press fit into the frame before threading in the BB30 converter. For a BB30 frame the sleeve can simply be discarded and the BB30 adaptor installed.
With two offerings a Praxis conversion can be used to convert your Specialized OSBB frame to either a Shimano 24mm standard or a Campagnolo UltraTorque crankset.
Di2 / EPS Compatibility
The shape of the conversion bottom bracket allows almost any wire to pass over the shell of the BB in most all frames. The holes in the shell are simply for weight savings and should not be used for wire routing. If you end up using these as a last resort make sure to protect your wiring from the spinning axle.
- "Praxis Works showed what we feel is the most thoroughly designed BB/PF30-to-24mm bottom bracket adapter currently on the market." - James Huang, Cyclingnews / Bike Radar [Link]