Other notes The extra width of the BB cups is replaced with more frame real-estate BB86/BB92īB shell width 86.5mm road, 91.5mm MTB. Installation Pressed bearings with stepped BB shellĬompatibility Designed specifically for 24mm spindles, no 30mm option 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.
