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I have a Shimano RevoShift 7 speed (indexed), that has trouble shifting between 6 and 7th gear. I disconnected the cable for a test, and I see that for the other gears, each click moves the cable about 2mm. But between 6 and 7, the cable only moves about 0.5mm. Is there a way to fix this? I do hear clicks for all gears.

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    These things are wonky at best. If you disconnect the cable and can move it through all the gears via pulling the cable, your best bet is to spend the 10 dollars on a new revoshift shifter (or some other 7 speed shifter, like a trigger shifter from Shimano/Microshift or a friction shifter). – Batman Apr 13 '16 at 1:03
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Revoshift and gripshift have to be the cheapest, nastiest, most accountancy-driven parts on any bike. They don't appear on mid-range or higher, only on bottom-entry level bikes.

SRAM and Rohloff twist shifts are much better, so its not a concept problem, its a design and materials problem.

Your best option is to buy a 7 speed pod shifter, which might also be called a thumb shifter, or even fit an old-school friction shifter with enough range.

http://bikeshop.evolutioncycles.co.nz/assets/category-view/raw/133246.jpg

A Shimano Altius M310 shifter as pictured should work perfectly for you, and its really cheap.

Do consider replacing the gear cables inner and outers at the same time, because you may-as-well.

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