10-25-2012, 02:26 PM
Hello all,
I'm riding a Specialized Sirrus 2010 hybrid style roadbike. It is an all aluminum frame that I've uprated with various parts for touring.
I recently replaced the cassette that took me cross-country with a shimano 8-speed replacement due to a problem with skipping, predominantly in 2F:4R gear. I was told that this was likely occurring due to cassette wear and since that cassette had seen over 4k in miles I figured it was time for a new one.
Well after having the shop do a thorough inspection and installation less than a month ago I popped my wheel off and put it back on only to get skipping again. This time however it is skipping across most of the gears.
I alleviated the problem somewhat by installing a new 8-speed chain -- I previously had a 9/8 speed chain. It now only skips in the middle gears.
When I took it in for a quick look the mechanic suggested that cables to the rear derailleur had a large amount of resistance which pointed to the derailleur not indexing exactly correctly. He lubed it up and sent me on my way.
The derailleur had been sticking if I let the bike sit for a day but would free up if I tapped it and wouldnt cause indexing problems after that.
As I've said it feels as though the bike indexes the gears properly but will skip out under moderate to high tension. I dont want to skip at a crucial moment because this is now my commuter bike and I've had bad crashes before because chains lost grip.
I read in another thread that perhaps the front chainring is worn and I'll check that tonight -- however how likely is it that the resistance in the derailleur cable is causing this problem? That explanation seemed suspect to me and I'd just like a second opinion.
Regards-
Robert
I'm riding a Specialized Sirrus 2010 hybrid style roadbike. It is an all aluminum frame that I've uprated with various parts for touring.
I recently replaced the cassette that took me cross-country with a shimano 8-speed replacement due to a problem with skipping, predominantly in 2F:4R gear. I was told that this was likely occurring due to cassette wear and since that cassette had seen over 4k in miles I figured it was time for a new one.
Well after having the shop do a thorough inspection and installation less than a month ago I popped my wheel off and put it back on only to get skipping again. This time however it is skipping across most of the gears.
I alleviated the problem somewhat by installing a new 8-speed chain -- I previously had a 9/8 speed chain. It now only skips in the middle gears.
When I took it in for a quick look the mechanic suggested that cables to the rear derailleur had a large amount of resistance which pointed to the derailleur not indexing exactly correctly. He lubed it up and sent me on my way.
The derailleur had been sticking if I let the bike sit for a day but would free up if I tapped it and wouldnt cause indexing problems after that.
As I've said it feels as though the bike indexes the gears properly but will skip out under moderate to high tension. I dont want to skip at a crucial moment because this is now my commuter bike and I've had bad crashes before because chains lost grip.
I read in another thread that perhaps the front chainring is worn and I'll check that tonight -- however how likely is it that the resistance in the derailleur cable is causing this problem? That explanation seemed suspect to me and I'd just like a second opinion.
Regards-
Robert