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low gear problem(6 posts)

low gear problemDaniel H.
Feb 21, 2002 7:49 PM
I am having a problem when I shift into my lowest gear,39-21. I can't get the adjustment right, if I go not far enough on the barrel adjuster then the shain skips and clicks but if I get it to the point that it will stay on the cog then the ultegra derailer is touching spokes and scaring the crap out of me. There just seems to be remarkably little space between the cassette and the drive side spokes. Is this a wheel dish problem, is there some sort of spacer that I can use on the cogset, or what? cause I am stumped. Thanks for all of your help in advance.
Daniel H.
My cassette is a shimano 11-21 and my wheels are 105.
re: low gear problemCT1
Feb 21, 2002 9:42 PM
Make sure your der hanger isn't bent inward. This will cause the der to rub the spokes and freak you out. ;)

You can usually visually see a bent der from the rear of the bike.

JG
That would be my first guess too.Spoke Wrench
Feb 22, 2002 5:51 AM
That's a fairly common problem. Bike shops have a tool to check that a bit more accurately than you can eyeball.

My second guess would be a wheel dish problem. Since the advent of 8&9 speed cassettes, lots of rear wheels have insufficient wheel dish. Bike shops have a gauge to check that too.

The last possibility is a worn rear derailleur.
What part of the derailleur is touching the spokes?dzrider
Feb 22, 2002 6:46 AM
When you figure that out, you may be able to see what has to move in order to fix the problem. I once got this from changing to thinner pulleys which caused the bolts holding them to stick through the inner side of the cage.
You may need a spacer...Lone Gunman
Feb 22, 2002 7:10 AM
I had a similar type problem with my drivetrain. I had Rolf Vector Comp wheels and wanted the plastic guard removed. The LBS did so and not long after that the rear wheel began making funny clunking noises. Upon one slow speed shift the chain went overtop of the big cog into the spokes and chewed them a bit. The problem was when I had the guard removed, it was also acting as a spacer that should have been there and we did not now have that thin spacer. In your case, you may just need a spacer to get your cassette a spacer away from the spokes, it should not effect your drive line but will give you that clearance. And also, what everyone else said about a bent derail is possible.
Yep, a clover washer to be exact. nmDanthrax
Feb 22, 2002 8:56 PM