Dmr axe m30 praxis works bbthe axe m30 bottom bracket is designed for use with a 30mm axle and dmrs axe cranks on a frame with a threaded bottom bracket shell features compatible with dmr axe cranks only for use with roadmtb frames with a 6873mm threaded bottom bracket shell machined aluminium cups with cartridge bearings 28mm drive30mm non drivebuy dmr componentsfrom chain reaction cycles the worlds largest online bike store