Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Jockey Pulley Rubbing on Largest Gear
#1
I'm currently adjusting the rear deraileur on my Specialized Sequoia and I've noticed that even if I screw the B-tension all the way in, there is still some rubbing on the largest gear. Is there anything I can do to fix this?
Live life one century at a time.
Reply
#2
What size is the largest rear sprocket?
Have you changed anything lately?
is the chain the right length?

If you run out of adjustment then it's possible to put a longer screw in, or remove and fit the existing screw in from inside. You shouldn't really run out of adjustment if everything is normal.
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#3
I don't know about my sprocket, where would I find that information?
Yes the chain just got replaced.
The mechanic at the bike shop put the new chain on so I would have thought it was the right length but now I'm having my doubts.
Live life one century at a time.
Reply
#4
To count sprocket teeth.
Put a mark on one of the points and then just count round. Some sprockets have the size imprinted on them. Too big a sprocket could cause jockey wheel rub.

But as you have had a new chain fitted and it was O.K. before then that would be my favorite culprit?

To check the chain length:-
http://bicycletutor.com/calculate-chain-length/

Obviously hard to do when the chain is already fitted.
But put the chain on large front chainring and largest sprocket at the back. There should be a slight amount of slack. (not sloppy and not tight.)
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#5
I have the same problem; the pulley is rubbing in my bottom two gears. The b-tension screw is literally not doing anything at all. I have an old dura ace RD-7400 6 speed derailleur, and if you look at the way the b-tension screw is set up, it's pretty obvious it won't do anything. I'm thinking about overhauling it (a la http://www.parktool.com/repair/readhowto.asp?id=76 ), but I'd definitely rather not.

Is there anything I could do to help figure this out like take some pictures, remove the derailleur and take pictures, maybe video, anything?

Also, I just replaced the chain (the length is correct, I'm sure of it), so I don't think that it's the problem, though maybe putting a chain.

Thanks a ton!
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Front derailleur won't shift into third (largest) gear bruin1989 1 8,475 08-01-2016, 07:14 AM
Last Post: Joe_W
  SRAM X9 - Rear Derailleur Pulley - Wobbles columkelly@yahoo.com 2 5,484 03-24-2015, 03:07 AM
Last Post: fredbyte
  Ebay Ball Bearing pulley for older 10 Tooth 6MM Simplex JanJ 1 2,931 11-11-2014, 11:11 PM
Last Post: JanJ
  Triban 3 Microshift front deraillieur rub in largest ring Ryanconway 8 5,319 08-20-2014, 07:06 PM
Last Post: DaveM
  Derailleur or pulley? skyemc85 3 3,357 07-06-2014, 09:18 AM
Last Post: skyemc85
  Rear derailleur problem, chain rubbing the lower pulley cage grandmaster 15 20,254 03-19-2014, 02:54 AM
Last Post: grandmaster
  Rubbing Front Derailleur Texcards 9 6,439 07-25-2013, 01:19 AM
Last Post: painkiller
  Ultegra jockey wheels Solidthegreat 4 5,355 06-22-2013, 10:08 PM
Last Post: painkiller
  Rubbing on second smallest cog gecici90 14 9,889 05-17-2013, 03:40 AM
Last Post: Bill
  Jockey Pulleys schrockbike 3 2,804 03-29-2013, 02:26 PM
Last Post: nfmisso

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed