AFAICT, that frame is a PF30 BB spec. So if your Rotor crank is a 24mm spindle, it works with adapters such as Praxis or WM in the BB. If it's 30mm spindle, then any PF30 BB should work (suggest WM "screw together" PF30 BB to prevent creaks). I assume the Masi is a 68mm shell width, so if the cranks are designed for wider shell (BBright or BB386), then you might need spacers and might have to check chainline.

scott s.
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