The praxis m30 thru bottom bracket is designed to be a proper bottom bracket bb for installing the praxis lyft carbon crank it will also work with race face ldquocinchrdquo or rotor ldquorexrdquo mtb cranks into 73mm bb30pf30 mountain frames the praxis patent pending design keeps the enduro 6806 cartridge bearings outboard of the frame for greater rigidity and free of framec clip tolerance issues that other systems deal with simply press in the longer non drive cup then thread th