Most of the Dia Compe levers the lever part is interchangable so if you buy a 77 and a 99 you can swap bits to get a 31.8mm 77.
Am I understanding that the Dia compe levers are interchangeable with different radius bars cause that could be an option.
The lever has 2 parts the one that clamps onto the bar and the moving part, you can swap them so another shape moving part goes on the larger size clamping part.
@dennisthemenace started
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Most of the Dia Compe levers the lever part is interchangable so if you buy a 77 and a 99 you can swap bits to get a 31.8mm 77.