ROTOR PF4129 DUB® Compatible Steel. With this bottom bracket, SRAM DUB cranks with a 28.99 millimeter crankshaft can be used in frames with PressFit BB86, BB89.5 or BB92 bottom bracket shells. The high-quality Enduro Bearings stainless steel ball bearings used with double-lipped LLB seals have a long service life.Specifications:- Weight: 80,5g- Material: Steel bearings- Compatible Crankset Brand: SRAM® DUB® compatible- Material Bearing: Steel- Axle diameter compatible: 28.99 mm (DUB® compatible)- Frame Type: BB86 BB89 BB92- Discipline: Road Triathlon Gravel Cyclocross MTB