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I don't know anything about bottom brackets, but I found this document which says (on page 16): Shimano cartidge-bearing bottom-bracket spindles are marked with letter codes that correspond to different length spindles. These codes and the corresponding spindle lengths are: Code Length MM 107mm and 110.5mm LL 113mm D-H 115mm YL ...


For that frame size, most likely 170mm, but you can measure from the centre of the pedal spindle to the centre of the BB: A popular online bike shop lists available crank lengths of 165, 170, 175, and 180. Presumably if you buy the bike "ready built" it will come with cranks chosen to match the frame size. But 165mm cranks are relatively rare outside of ...

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