![]() Other notes Can be prone to undoing itself because non-driveside is a standard thread BB90/BB95 Other notes External cups now exist that will take 30mm spindles Italian threadedīB shell inner diameter 1.375in (34.92mm) x 24 TPI Other notes Bottom bracket must be specced with correct shell width and spindle length ISO threaded externalīearing inner diameter 24mm (Hollowtech II), 24/22mm (GXP), 25mm (Ultratorque/Powertorque) Road bike groupsets: everything you need to knowīottom bracket standards and compatibility ISO threaded internalīearing inner diameter N/A, internal BBs have integrated spindleīB shell width 68mm road, 73mm mountain, 83mm downhill, 100/120mm fat bikeĬompatibility Square taper, Octalink, ISIS.Before we get stuck into the nitty-gritty of each standard though, we’ve put together this helpful crib sheet that runs through all of the key specifications.
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