gears slipping
10-21-09 | 12:06 AM
#1
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 310
Likes: 0
From: Seattle, WA
Bikes: Cervelo R3, Trek 6500, Brompton M6R, Dahon Speed D7, TidalForce S-750 custom, Breezer Uptown
gears slipping
Hi,
My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.
I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.
I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?
Thanks.
Rock.
My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.
I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.
I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?
Thanks.
Rock.
10-21-09 | 12:11 AM
#2
Big Nerd
Joined: Jul 2009
Posts: 73
Likes: 0
From: Chicago, IL
Bikes: Serotta Fierte Steel
I would think that it likely has to do with pulley alignment or cable tension IF you're sure your chain isn't worn. (Usually this is a fault of your chain if you frequently change gears while hammering)
If you have realigned the derailleur and reset the tension and your gears still slip, I would take it to an LBS so they can tell you if something is bent in the derailleur or on your hanger.
If you have realigned the derailleur and reset the tension and your gears still slip, I would take it to an LBS so they can tell you if something is bent in the derailleur or on your hanger.
10-21-09 | 01:08 AM
#3
cab horn
Joined: Jun 2004
Posts: 28,353
Likes: 31
From: Toronto
Bikes: 1987 Bianchi Campione
Hi,
My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.
I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.
I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?
Thanks.
Rock.
My bike has Ultegra components and low gears slip when climbing. I'm not sure of the exact teeth but I'd say that teeth 2-4 (going from low to high gear) on the rear cassette slip. It sometimes slips on flats but it's definitely noticeable when climbing. It's to the point where I'm either on gear 1 or gear 5 to avoid the gears slipping.
I thought it might be a bad cassette but the old cassette was only about 4 months old. I bought a new cassette anyway but it's still slipping at the same place. I suppose it could be the chain but the chain is only 6 months ago.
I did remove the rear cassette to install it on a new set of wheels. Is it possible for me to have messed up the teeth with the chain whip when I was removing / installing the rear cassette?
Thanks.
Rock.
Check/test for twisted/frozen link. Then start thinking about replacing the chain/cassette. It is entirely possible to wear a chain out in 6 months.
10-21-09 | 09:30 AM
#4
Senior Member
Joined: May 2008
Posts: 590
Likes: 1
From: Beverly Hills, MI
Bikes: '72 Fuji Finest, '80 Austro-Daimler Inter 10, '06 Fuji Team Issue, '06 Salsa Las Cruces, Nashbar Frame single speed
I would bet it's your chain - you may have a link or two that are slightly bent or stiff. I had similar problems with a chain that I had "dropped" off of the small chainring earlier this year. Turns out I had just slightly bent a couple of links. I replaced the chain and my problems were solved!
