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elevate the back wheel, then use tape to make a flag on the frame and the back wheel in a spot where one of the cranks will point to the tape. then go through all the gears making a note of how many revolutions it takes for the tape flag you have created on the back wheel to be back in sync with the crank. check your notes.

I'd do a net search for "Sheldon Brown online gear calculator".

Input the specifics of your bicycle into the boxes, then hit "calculate". Done!

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Q: How do you determine what gears are duplicate on a 27 speed mountain bike?
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