Race Face’s latest cranksets and Rotor’s Rex cranks both use a 30mm spindle designed to work with virtually any frame, though some of those frames may need their external cup threaded bottom brackets. But, if you’re running a frame with BB30 or PressFit30 shells, Praxis Works’ new M30 Thru bottom bracket could be the upgrade you’re looking for.
Not only should it do away with most spacers, but it pushes the bearings outside of the shell for a wider stance. That should make the entire assembly stiffer. Even better, it uses their expanding collet system to essentially lock the BB into the frame so it can’t creak, rock or walk out. A compressible O-ring on the non-drive side ensures a snug fit against the frame despite any out-of-tolerance issues your particular bike may suffer from.
Because the two sides thread together, the bearings remain in perfect alignment, leaving the spindle to spin freely. Retail is $85, but they recommend using their M30 tool to press it in…
The tool ensures scratch free installation and is available separately and are needed for proper installation.
The forged and machined heat treated alloy cups and shell hold high quality steel bearings. It’s designed to fit bike running ISCG05 and seat tube mounted chain guides, but won’t work well with ISCG03 mounts. The part is sized to fit 73mm mountain bike bottom bracket shells only.
Available in October 2015.