Hi
I have been having a really annoying problem with my rear derailleur and cassette (13/26) on my Campag Centaur 10 speed kit. The bike is only 3 months old and I clean it regularly ( every other day ).
I have found that when I shift up the cassette the chain jumps around and makes a hiddious noise - you know the kind - grinding metal/hacking noise. This only happens when the chain is in the middle two sprockets. It can take around 5 seconds for it to engage and when it settles I can feel a vibration and friction in my pedals. The derailleur also makes a slight grinding noise when in this gear and on closer inspection I noticed that the derailleur arm move backwards and forwards slightly - Is this normal?
I have checked the cables and cleaned then lubed the derailleur.
I have dialed the derailleur so that it shifts well up and down the cassette. This problem only happens after around 8 shifts - if I shift up and down the noise goes away and it runs fine.
Also, I have recently noticed that the chain jumps after every 10 links or so when I back pedal on the smallest cog (this is less important but it may be a indicator as to what is wrong).
I have done 2700 miles on it so parts may be becoming worn.
Any Ideas - I hate the thought that I might be prematurely wearing it out.
Chris
I have been having a really annoying problem with my rear derailleur and cassette (13/26) on my Campag Centaur 10 speed kit. The bike is only 3 months old and I clean it regularly ( every other day ).
I have found that when I shift up the cassette the chain jumps around and makes a hiddious noise - you know the kind - grinding metal/hacking noise. This only happens when the chain is in the middle two sprockets. It can take around 5 seconds for it to engage and when it settles I can feel a vibration and friction in my pedals. The derailleur also makes a slight grinding noise when in this gear and on closer inspection I noticed that the derailleur arm move backwards and forwards slightly - Is this normal?
I have checked the cables and cleaned then lubed the derailleur.
I have dialed the derailleur so that it shifts well up and down the cassette. This problem only happens after around 8 shifts - if I shift up and down the noise goes away and it runs fine.
Also, I have recently noticed that the chain jumps after every 10 links or so when I back pedal on the smallest cog (this is less important but it may be a indicator as to what is wrong).
I have done 2700 miles on it so parts may be becoming worn.
Any Ideas - I hate the thought that I might be prematurely wearing it out.
Chris