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CONVERSION BB

THE PRAXIS CONVERSION BOTTOM BRACKET

Now available in versions for Shimano, SRAM, and Campy ULT Torque

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THE PRAXIS CONVERSION BOTTOM BRACKET

NOT AN ADAPTOR: Our conversion BB is designed to be a proper BB for either Shimano™, SRAM GXP, or Campy Ultra Torque cranks in either BB30, PF30, or Specialized’s OSBB frames. Our patent pending design keeps the cartridge bearings outboard of the frame right on spec for greater rigidity and free of frame/c-clip tolerance issues that other systems deal with. Simply press in the longer Non Drive Cup, then the shorter drive cup threads into it. As the Drive cup threads in, our trademark Praxis Collet system expands to a precise machined limit evenly dispersing pressure for a super tight fit.

With both cups connected and our collet set exactly to spec, there is no chance the bearings can come out of alignment or walk out of the frame. This design also uses a compressible o-ring on the non-drive side cup to compensate for frame shell width discrepancies.

THE SOLUTION:

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"Praxis Works showed what we feel is the most thoroughly designed BB/PF30-to-Shimano™ bottom bracket currently on the market. The bottom bracket uses a collet system that wedges itself tightly inside the shell with even pressure throughout." James Huang
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"We were really excited to see the Praxis Works Converter. This super-smart piece of retrofit engineering is designed to fit some of the most common designs of press-fit BB and fits snugly into the bottom bracket so that the cups are securely fixed to eliminate creaking. What makes this converter so clever is the fact that it doesn’t just clamp the shell from the outside, but thanks to the threaded collet, the middle expands slightly to grip the inside of the frame where the bearings normally sit and holds itself captive with an expansive force too."

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THE PRAXIS COLLET : This greatly reduces the chances for creaking and other unwanted noises associated with the lesser “Band Aid/Spacer” type adaptors in the market. The cartridge bearings included with the Shimano and SRAM version are high quality steel with shield type quad-ring seals. Available in either 68mm for road, or 73mm for MTB, the Praxis Works BB is the most rock-solid Conversion BB available.

SAY NO TO "BAND AID/SPACER" ADAPTORS

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  • Separate L & R adaptors can wiggle/walk out of frames
  • Subject to more frame/spindle tolerance issues
  • Don’t handle heavy pedal loads well
  • Higher chance of creaks and noises from bad fit

SHIMANO

BB30/PF30/OSBB to Shimano Hollowtech II

Praxis Works 68mm BB30/PF30

MSRP: $85.00 – LEARN MORE

SRAM

BB30/PF30/OSBB to SRAM GXP/ISIS2

Praxis Works 68mm BB30/PF30

MSRP: $85.00 – LEARN MORE

CAMPAGNOLO

BB30/PF30/OSBB to Campagnolo UltraTorque

Praxis Works ROAD 61/68mm OSBB

MSRP: $85.00 – LEARN MORE


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