Hi all,
So - circa 1 year old 105 rear mech, new chain and cassette recently installed.
When riding in the big ring up front and admittedly, cross chaining, I was getting a reasonable amount of 'chatter' from the rear casette/rear mech area when in the top two (largest) sprockets.
Upon closer inspection, I can see that the chain is gently rubbing the rear mech hanger cage in these two top gears.
My instant thought was a bent mech hanger, but the shifting is spot on so I ruled this out. My only other thought is the bearings in the pulleys are shot/theres too much play in the lower pulley that it cant hold its own and help keep the chainline straight?
Is this normal, a result of cross chaining, or should I just stop being stingy and splash out on a new rear mech?
Keen to hear your thoughts!
Rear mech hanger chain rub
Moderator: robbosmans
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Yeah, you can get a combination of twist and bend that means the shifting is still ok, i had it on my MTB, gears ran perfectly for a couple of years after a "field fix".
Put an alignment gauge on it and it was WAAAAAAAAAAY out.
Seen it in a couple of other bikes.
Probably worth a look.
(I've got a 2 year old 105 mech which i abuse endlessly, high load shifts, cross chaining and so on. No chatter on that.)
Put an alignment gauge on it and it was WAAAAAAAAAAY out.
Seen it in a couple of other bikes.
Probably worth a look.
(I've got a 2 year old 105 mech which i abuse endlessly, high load shifts, cross chaining and so on. No chatter on that.)
Yeah I agree, perhaps the cage has somehow twisted slightly in a way that still permits shifting.
At the end of the say, I understand how cross chaining places extra stress/wear on the drivetrain and should be avoided, BUT, it should still be mechanically possible if the drivetrain is set up correctly. Clearly it isn't in my case, so off I will trot to buy a new rear mech.
Thanks both for the help.
At the end of the say, I understand how cross chaining places extra stress/wear on the drivetrain and should be avoided, BUT, it should still be mechanically possible if the drivetrain is set up correctly. Clearly it isn't in my case, so off I will trot to buy a new rear mech.
Thanks both for the help.
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com