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Old 10-18-19, 06:12 PM
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nomadmax 
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Does it slip on one cog or all of them?

Usually:

One cog = a cassette/cog problem

All cogs = a chain problem

Slowly pedal the crank backwards with your hand. Look at the chain near the jockey wheels and look for a stiff link. There are other causes including a bent RD hanger but a stiff link is usually to blame.

Last edited by nomadmax; 10-19-19 at 04:31 AM.
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