Praxis M30 THRU Bottom Bracket (30/30mm) – BB30/PF30 73mm MTB
SKU code: DSG-PX73-4101M30Thu
In Stock
A bottom bracket for cranks with a 30mm spindle that stays 30mm the whole way across, so both bearings are 30mm. It's the BB Praxis specifies for its Doon and Lyft cranks, and it suits several other brands' 30mm cranks too.
Highlights
- 30mm drive / 30mm non-drive sealed steel cartridge bearings
- For Praxis Doon and Lyft, Race Face/Easton Cinch, Rotor 3D+, SRAM 30mm (PF30/386EVO) and Cane Creek eeWings cranks
- BSA, T47 external, internal and asymmetric, BB30/PF30, BB86/90/92 and BBright versions
- Praxis supplies a 2mm dust cover each side as the base setup
- Spindle length check: 103mm or longer for road, 108mm or longer for MTB
Other brands' cranks
Praxis's base setup uses a 2mm dust cover on each side, but every crank brand sets up differently and some need extra spacers, so follow your crank maker's instructions. Before ordering, measure your spindle: Praxis asks for 103mm or longer on road cranks and 108mm or longer on MTB cranks.
Threaded, collet or press-fit
BSA and T47 versions thread in with a single Praxis M30 tool and are tightened to 40Nm. BB30/PF30 and BBright versions use Praxis's expanding collet and need a press plus two M30 tools. The BB86/90/92 version is a press-fit steel cup with an integrated bearing, fitted with a bearing press and removed with a bearing remover.
Options
| Shell | Frame | Install tools |
|---|---|---|
| BSA 68/73mm | BSA threaded: 68mm road or 68/73mm MTB; cup spacers for 68mm MTB | One Praxis M30 tool |
| T47 External 68/73mm | T47 external-bearing: 68mm road or 73mm MTB | One Praxis M30 tool |
| T47 Internal 85.5mm | T47 internal-bearing road frames, 85.5mm | One Praxis M30 tool |
| T47 Asymmetric | T47 asymmetric road/gravel frames, 76.75mm | One Praxis M30 tool |
| BB30/PF30 68mm Road | BB30 (42mm) or PF30 (46mm) road, 68mm; road only; expanding collet | Press, plus two Praxis M30 tools |
| BB30/PF30 73mm MTB | BB30 (42mm) or PF30 (46mm) MTB, 73mm; expanding collet | Press, plus two Praxis M30 tools |
| BBright | BBright road frames (79mm wide, 46mm bore); road cranks only; expanding collet | Press, plus two Praxis M30 tools |
| BB86/90/92 | 41mm press-fit steel cups with integrated bearings: BB86 road (86.5mm), BB90 (89.5mm) and BB92 (92mm) MTB | Bearing press; bearing remover such as the Park BBT-30.4 |
Compatibility & fit
For full-length 30mm spindles: Praxis Doon and Lyft, Race Face/Easton Cinch, Rotor 3D+, SRAM 30mm (PF30/386EVO) and Cane Creek eeWings cranks. Praxis M30 cranks (30/28mm) take the Praxis M30 bottom bracket instead, and 24mm, GXP and DUB spindles need a different BB. BBright is for road cranks, and BB90/92 are MTB shells. Collet versions need a shell clear of internal cable guides or screws. Fitting is a separate workshop service: the Tune Cycles workshop can check spindle length and spacers for your crank and fit the right version.
- For full-length 30mm crank spindles
- 30mm bearings on both sides
- Eight shell versions
- Forged and machined alloy cups on threaded and collet versions
- 2mm dust covers each side as base setup
| Brand | Praxis |
|---|---|
| Spindle | M30 THRU: 30mm drive / 30mm non-drive |
| Crank fit | Praxis Doon and Lyft; Race Face/Easton Cinch; Rotor 3D+; SRAM 30mm (PF30/386EVO); Cane Creek eeWings |
| Spindle length | 103mm or longer (road); 108mm or longer (MTB) |
| Bearings | Sealed cartridge steel |
| Cups | Forged and machined heat-treated alloy (BSA, T47, BB30/PF30, BBright); precision-ground steel with integrated bearing (BB86/90/92) |
| Threaded cup torque | 40Nm |
| Average weight | 100g BSA and T47; 130g BB30/PF30 68mm and BBright; 65g BB86/90/92 |
| Options | Shell: BSA 68/73mm, T47 External 68/73mm, T47 Internal 85.5mm, T47 Asymmetric, BB30/PF30 68mm Road, BB30/PF30 73mm MTB, BBright, BB86/90/92 |
| SKU | DSG-PXM30THRUBB |
| Brand | Praxis |
