Hi everyone
Help! I have a Cube road bike that has Shimano Sora gears. I’m having a serious problem with it ‘jumping’ when running on the smallest gear at the rear. I’ll try to describe ‘jumping’; it’s not actually trying to climb onto the next gear but appears to be perhaps catching on the top of the teeth on the same gear it’s already on – if that makes sense. It gets worse if it’s under load but does it if I just crank the bike by hand on my turbo setup. When under load i.e. being ridden, the jump is a very noisy ‘clank’ noise. It’s not possible to ride in that gear.
I have tried adjusting the position of the jockey left or right using the adjuster screw and clearly the derailleur moves left or right as I adjust. However, that doesn’t seem to stop it jumping no matter where I put it. The hanger looks straight.
I checked to see if the chain has stretched and I think not. Compared to my other road bike (different gear) the chain does appear to be much easier to twist. (That is to say if I get hold of it between my fingers and rotate it along the chain length. I did this in the middle of the span to the front gear).
Any ideas? Is it adjustment (but I can’t see how it can be) or is it something else? Could it be the bush in the idler gear is worn? (It does wobble a bit more than my other bike). Or is the chain simple knackered?
I can’t possibly be the only person who has experienced this.
Any advice gratefully received.
Les
Help! I have a Cube road bike that has Shimano Sora gears. I’m having a serious problem with it ‘jumping’ when running on the smallest gear at the rear. I’ll try to describe ‘jumping’; it’s not actually trying to climb onto the next gear but appears to be perhaps catching on the top of the teeth on the same gear it’s already on – if that makes sense. It gets worse if it’s under load but does it if I just crank the bike by hand on my turbo setup. When under load i.e. being ridden, the jump is a very noisy ‘clank’ noise. It’s not possible to ride in that gear.
I have tried adjusting the position of the jockey left or right using the adjuster screw and clearly the derailleur moves left or right as I adjust. However, that doesn’t seem to stop it jumping no matter where I put it. The hanger looks straight.
I checked to see if the chain has stretched and I think not. Compared to my other road bike (different gear) the chain does appear to be much easier to twist. (That is to say if I get hold of it between my fingers and rotate it along the chain length. I did this in the middle of the span to the front gear).
Any ideas? Is it adjustment (but I can’t see how it can be) or is it something else? Could it be the bush in the idler gear is worn? (It does wobble a bit more than my other bike). Or is the chain simple knackered?
I can’t possibly be the only person who has experienced this.
Any advice gratefully received.
Les