Noisy drivetrain, shimano 105 rear, tiagra front

Forum guidelines BT super discount
General Discussion Triathlon Talk » Noisy drivetrain, shimano 105 rear, tiagra front Rss Feed  
Moderators: k9car363, alicefoeller Reply
2009-07-19 5:06 PM

Master
1963
10005001001001001002525
Subject: Noisy drivetrain, shimano 105 rear, tiagra front
Trying to help fix a bike. I can't figure this out. The bike seems all right, shifts decently enough but just seems noisy. I just spent 1/2 hour cleaning everything thoroughly and apply some lube to the chain but I can't seem to get it to quiet down.

The bike's less than a year old and the chain is fine (checked for stuck links). The noise is clearly coming from the rear. Hard to explain the noise exactly but it's kind of squeaky (both plastic toothed gears on the derailleur look fine)

Thoughts?

2009-07-19 5:33 PM
in reply to: #2294665

Master
1963
10005001001001001002525
Subject: RE: Noisy drivetrain, shimano 105 rear, tiagra front
A second and third round of lubing, quieted her right down.

How-to on the way....
2009-07-20 9:17 AM
in reply to: #2294665

User image

Master
2426
200010010010010025
Central Indiana
Subject: RE: Noisy drivetrain, shimano 105 rear, tiagra front
Besides a dirty/sticking chain, noise can be due to adjustment being off slightly.  If adjustment is optimal, time to look at other stuff.  How many miles on the chain, and could the bike be damaged (crash, bike fall over, etc.)?

Carefully measure the chain for 12 in. Measure from link pin to link pin. Should line up almost exactly.  If 2nd pin is off by 1/16" chain is worn & should be replaced.  A worn chain also causes cassette cogs to wear faster, so may have to replace the cassette too.

Look at the rear derailleur (RD) from behind.  The 2 "toothed gears" (called pulleys or jockey wheels) should line up with the cog they are under.  If they are clearly off line then the RD may be damaged or the bracket holding it to the bike's frame (derailleur hanger) could be bent.  A local bike shop should be able to help you out.
New Thread
General Discussion Triathlon Talk » Noisy drivetrain, shimano 105 rear, tiagra front Rss Feed