Old 03-17-21, 08:51 PM
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6510 and some old Sora front shifters have intermediate trim positions for eliminating cage chain rub in certain gear combinations. If the chain is rubbing, push the lever part way to the next click. The amount of able pulled to get to these "in between clicks" would likely be about half what is required to make the shift all the way to the next ring. So one could speculate 7 mm vs 13 mm. These trim positions are eliminated in some of the newer shifters.

Sometimes the only way to mix and match Shimano is to mount it up and play.

Last edited by Ross200; 03-17-21 at 10:00 PM. Reason: wrong model number
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