Our conversion BB is designed to be a proper BB for Shimano™ Hollowtech cranks in either BB30, PF30, or Specialized's OSBB frames. Our patent pending design keeps the cartridge bearings outboard of the frame right on Shimano™ 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 Collet system expands to a precise 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 wiggle/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.
As the drive cup threads down into the non-drive cup, our Collet expands to a precise limit dispersing pressure inside your frame for a super tight fit.
Our unique collet system also 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 are high quality steel with shield-type quad-ring seals. Available in either 68mm or 73mm widths, the Praxis Works Conversion BB is the most rock-solid BB for Shimano™ cranks on BB/PF30 frames.
"Praxis Works showed what we feel is the most thoroughly designed BB/PF30-to-24mm bottom bracket adapter currently on the market. The bottom bracket uses a collet system that wedges itself tightly inside the shell with even pressure throughout." —James Huang, Bike Radar
Includes PF full sleeve
Includes 2 sleeves for SBC Carbon Road Frames