I have a Raleigh maybe 8 years old with shimano 15 gears. How do I reassemble the rear gearing after fitting new tyres? Everything seems to be in correct position but a small bolt with captive nut seems to fit in a triangular hole above the axle, on frame but this then throws the gear all out of position. Any ideas?
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Sounds like you're placing the tire back into the wrong gear to begin with. Always remember what gear you left off on as it can ruin your entire setup in a matter of seconds.