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Ascent Revolution Bottom Brackets BB386 Size:Shimano 24mm Headset FSA 1 1 8″ upper and GSDA Variant:29.92mm USATTSAFTKN1064332 The Padding is made Headset FSA 1 1 8″ upper and lower bearings Head Tube Diameter 1 1 8″ upper and lower Saddle Rail Clamps 7x7 and 7x9 Bottom Bracket CeramicSpeed T47A Aluminium cups CeramicSpeed bearings available for DUB and 24mm Cable Routing Internal Compatible Components Electronic Brake type Disc Max Rotor Size 160mm front & rear Max Chainring 54 tooth Front Axle 12 x 100mm thru axle Rear Axle 12 x 142mm thru axle Wheelset Black Inc SIXTY TWO Wheel Size 700c Max Tire Clearance 34mm Measured INCLUDED ACCESSORIES Black Inc Aero Integrated Bottle Cages & Computer mount Manufacturer Warranty Limited Lifetime Warranty Groupset Shimano Ultegra Di2 8100 Speed 2x12 speed Crank 52 36T Cassette 11 34T Rotors 160 140mm 6mm stack height (sole thickness) for improved stability