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170 arms and 50/34 Praxis rings. Excellent power meter, just beginning to get some traction and awareness here in the US. It’s built into the Praxis Turn crankset. Has a 30mm spindle and can be installed in a standard BSA English threaded BB (these are the BB cups I have with the unit), or you can also install it with the Praxis conversion for BB30 or PF30 frame sets.