Italian threaded cups will have marking stating “36x24. Both sides tighten clockwise and loosen counterclockwise. None of the replacements I've found seem to be quite the same as the original. ![]() Apparently the screw causes the sleeve to expand inside the bottom bracket shell, holding it in place. There is a small protrusion or bump inside the bottom bracket shell on the frame that is keeping the new bottom bracket from easily going in. Now that I've actually removed the broken cable guide I can see that it has a built-in sleeve that the screw goes into. The less common Italian has both left and right sides with right-hand threading. I've pulled the old bottom bracket from my son's Trek MT60 and am trying to replace it with a Sinz sealed bearing unit. The right-side (drive-side) thread is a left-hand thread, which tightens counterclockwise and loosen clockwise. Weve solved your installation problems for 2016-and up Evos and Super Six Evo HI-Mods. The common threading for bottom bracket shells is called “English.” The left-side cup is a right-hand thread direction, which tightens clockwise and removes counterclockwise. Properly install the PF30A bottom bracket with our detailed guide. ![]() The common three piece crankset has left and right arms with the bearing and spindle integrated. Two-piece crankset with a thru-spindle bottom bracket The spindle passes through the bearings in the bottom bracket shell. ![]() For the two-piece crankset, there is a left and right arm, but the spindle is attached to one of the cranks.
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