Road Bike Chain Jumping

This started on a new chain so i changed the cassette. As an addendum to other answers this was happening to me not ghost shifting but the chain jumping forward. The chain jumping when putting the power down is a classic sign of something in the drivetrain being worn out.

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The only difference between the old and new chain i can spot is that the new one is 2 or 3 links longer but the derailleur still has plenty of clearance in the lowest gear so i m not sure if this.

Road bike chain jumping. A test ride demonstrated that it only jumped in the middle chainring by far the most used even though it didn t look much more worn than the other rings. 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. If you replace your chain and cassette and the chain still skips your crankset or chainrings will most likely need to be. Bike chain skipping jumping after replacing multiple parts.

Unfortunately if you have been using wd40 as a lube you may well have worn out the chain and or cogs and or chainset prematurely as it is just too thin for this application and will also act as a solvent washing out any existing oils. The old chain was a kmc x8 1 2 x 3 32 w reusable master link and i replaced it with a kmc x8 93 8 speed chain and now for some reason the chain keeps slipping under any load in any gear.