T47 is a new bottom bracket standard that is becoming increasingly popular with custom bike manufacturers.The bottom brackets have a high durability, are stable and a smart choice for every biker due to the simple replacement and maintenance of the bearing. Base are outer bearing shells and a center sleeve made of CNC machined aluminum. O-rings between the center sleeve and the bearing shells prevent water and dirt from getting into the interior of the inner bearing via the frame. Stainless steel ball bearings, which are manufactured by warehouse specialist INA for Hope in Switzerland, rotate in the bearing shells. The ball bearings are double sealed and additionally protected by a labyrinth seal.With this bottom bracket you can drive your Shimano MTB and Road crank in a frame which is designed for the T47 threaded bottom bracket standard.Hope Bottom Bracket Stainless T47 Featuresintended use : Road, MTBMaterial bearing shell: aluminumMaterial bearing: stainless steelBearing Type: T-47Inner bearing housing Width: 68 mm - 73 mmCrank shaft diameter: 30 mmCrank wavelength: not specifiedCompatibility crank: cranks with 30 mm shaftBearing: stainless steel bearings