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Praxis: what it makes and how it fits
Praxis, trading as Praxis Works, is an American maker of cranks and bottom brackets known for its conversion bottom brackets that let one crank run in shells it would not otherwise fit.
About Praxis
Praxis, trading as Praxis Works, is an American maker of cranks and bottom brackets known for its conversion bottom brackets that let one crank run in shells it would not otherwise fit.
Praxis is closely associated with thread-together and conversion bottom brackets, where two cups screw to each other through the shell to give a pressfit frame a quiet, serviceable interface. This is a common cure for creaking pressfit shells such as PF30 and BB86.
What it makes for your frame
Praxis cranks use a spindle sized to run through the common shells with the matching Praxis bottom bracket, so fitment is decided by the shell standard and the crank spindle. Its M30 platform is a 30 mm class spindle designed to work across a wide range of shells.
For a swap, identify the shell first, then choose the Praxis bottom bracket that converts or fits that shell to your crank's spindle.
Choosing the right part
With Praxis, as with any maker, the frame decides the fitment. Identify your bottom bracket shell and crank spindle, or your headset and seatpost standards, then choose the Praxis part built for that standard.
The fitment tool returns the exact bottom bracket for your shell and crank, including whether it drops in, needs a specific bearing or needs an adapter, so a brand choice never becomes a fitment gamble.
Before buying, measure the shell width face to face and confirm the crank spindle diameter, because a Praxis bottom bracket is chosen by both the shell standard and its road or mountain width. A part that suits one width will not seat correctly in the other, even when the standard name is the same.
| Fact | Value |
|---|---|
| Category | Cranks, bottom brackets |
| Signature | thread-together conversion bottom brackets |
| Spindle platform | M30 (30 mm class) |
Compiled from manufacturer data and the cited references.
Fitting a Praxis part?
Open the BB compatibility toolPick your shell and crank spindle to see the exact bottom bracket you need.Find Praxis bottom bracket on eBayaffiliateRelated
Sources: List of bicycle part manufacturing companies (Wikipedia, CC BY-SA) ยท Wheels Manufacturing bottom bracket fitment reference