Bottom Bracket Assembly BB-MT501 0 0 0 2 0 5 5 4 T B R M B U - - - B M B B S B ITEM SHIMANO INTERCHANGE- DESCRIPTION NO. CODE NO. ABILITY 1 Y2KJ98010 Left hand cup (B.C.1.37 x 24T) english thread 2 Y1F813000 Spacer (2.5 mm) A A 3 Y1J898060 Inner cover and O-...