SHIMANO 105 R7000 REAR DERAILLEUR SET UP
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Try pedalling forwards. That might help..0
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Sounds normal to me.
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Bent hanger
Sticky link in chain
Bad chain line
All a possibility0 -
Thanks I though the first two but the bike is only 7 months old0
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I wouldn't have thought it was a bent hanger if you can change gears without issue. You could try adjusting the B tension screw on the rear derailleur. It could be the derailleur is a bit too far from the cassette.
Otherwise I would look at changing the chain, then the cassette. (That is assuming it hasn't always done this).0 -
I have changed the cassette but not the chain and checked the b tension which is fine.0
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Does it jump when you pedal forwards.0
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No it doesnt.0
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is the no9 gear picking up the chain as you spin it backwards? I doubt if it is the RD as that should only affect things pedalling forwards. Are the chin and cassette clean and correctly lubricated? old lube can get a bit sticky. especially grease from the cassette instalation.0
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If By no9 if you mean 13t sprocket this works perfectly. The chain was last cleaned about 2 weeks ago and the cassette is clean0
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Yes, the 13t on your cassette. When it is in 12t and you pedal backwards, does the chain get snagged on the edge of the 13t?0
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i dont think so as its that as its not rattling against the 13t, and if i loosen the tension on the rd cable it doesnt make any difference.0
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Pop it on a work stand and observe as you rotate it backwards, then you should be ablecto see what is causing the chain to lift. It won't be the rd because you are pedalling backwards.... iscthis when in the big ring or small on the chainset?0
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it's in the big ring. when i have it in the work stand it seems as though its one part of the chain that is lifting on the 12t cog.0
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Is it the jockey wheel teeth touching the cassette?0
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Never assume. A hanger can look straight but be bent slightly even on a brand new bike. Although it doesn’t sound like the cause of the issue of the gears all change correctly.chris74 said:Thanks I though the first two but the bike is only 7 months old
In my experience it will be the chain catching the next bigger cog teeth slightly. Could be a chain line issue (washer/ spacer fitted/ not fitted) on the crank axle. Worth a check. TBH it’s not really an issue if it doesn’t do it pedalling forwards.
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The teeth aren't remotely symmetrical so I'm not surprised they don't work equally well in both directions.
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The chain should not fall off just by pedalling backwards.
agree there is no real reason for pedalling backwards but the chain shouldn't fall off..The camera down the willy isn't anything like as bad as it sounds.
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The OP said "jumps", not quite sure what they mean by that. I didn't understand it to mean the chain completely comes off the 12 tooth sprocket.
There is also the possibility the 12th tooth sprocket is simply more worn that the rest as the bike had been used.
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It's a new cassette so isnt worn.0
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i do have fulcrum racing 3 wheels on as well but cant see this been the issue unless its the spacer on hub0
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Sounds like the chain is most likely suspect, have you tried it with a new chain? It is usually chain that wears first and some times strangely quickly.0
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So, replaced the cassette but kept the old chain.0