Mountain Bike Chain Jumping Under Load. Abby Hippley, mechanic, bike builder and former demo driver for Santa Cruz Bikes says, "Your chain—more accurately the cables that connect your shifters to your derailleurs to move the chain. This includes the shifters, chain, front and rear derailleur, the cassette and crankset.
Prior to the chainswap I had no problems, hving been out in strong winds and. Most bike owners, however, will have to diagnose an unusual noise at some point. The bike is like new, with wax still on the chain, so nothing is worn out.
Skipping involves the chain jumping over the tops of the sprocket teeth under load.
One of the most frustrating problems that can occur on a bike is "chain slip" You are pedaling along happily and come to an incline, as you start to apply more pressure to the pedals, clunk – your foot slips forward an inch or two as the chain slips off a cog tooth.
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A worn chain changes the pitch of the chain and wears out the top of the cassette teeth causing the chain to skip. Before jumping into the noises and solutions, a good starting point with all bike noises is isolating where it's coming from by substituting different parts. It's sorta like a worn tire with worn knobs don't grip as well.