Shimano 24mm to BB30/PF30 73mm MTB Bottom Bracket

Praxis Works Shimano Hollowtech II Bottom Bracket Converter

The Praxis Works Shimano Hollowtech II bottom bracket converter allows installation of Shimano Hollowtech II cranks in BB30 or PF30 MTB frames. Its patent-pending design positions the cartridge bearings outboard of the frame to Shimano specifications, improving rigidity and eliminating frame and C-clip tolerance issues common in other conversion bottom brackets.

Installation is simple: press in the longer non-drive cup, then thread the shorter drive cup. As the drive cup threads in, the Collet system expands to a precise limit, evenly distributing pressure for a secure fit. A compressible O-ring on the non-drive side compensates for frame shell width discrepancies, keeping the bearings perfectly aligned.

Features

• Patent-pending outboard bearing design

• Collet-style non-drive cup expansion prevents movement

• Non-drive O-ring compensates for frame width variations

• Compatible with Shimano Hollowtech II cranks

• Forged and machined heat-treated 7075 T6 aluminium

• Steel cartridge radial bearings

Important Notes

• Not compatible with BBRight, BB386EVO, or Cannondale BB30A frames

• Frame shell must be free of inner obstructions (cable guides, screws)

• 73mm MTB version not compatible with road cranks

• Installation requires two standard BB tools (16 external notches, 44mm ID) plus a press tool or drift

• MTB mounting: ISCG05 – compatible, ST – compatible, ISCG03 – not compatible

Specifications

• For Shimano Hollowtech II cranks only

• Forged & machined heat-treated 7075 T6 aluminium

• Steel cartridge radial bearings

• 73mm MTB version

• Compatible with BB30 and PF30 frames