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#1
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Rear Derailleur Catch 22
My rear derailleur doesn't shift cleanly. If I increase the cable
tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. |
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#2
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Rear Derailleur Catch 22
On Mar 6, 5:32 am, Robert Lee wrote:
My rear derailleur doesn't shift cleanly. If I increase the cable tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. make sure shifter cable is smooth. Lube cable below bottom bracket. make sure it has no kinks, bends, rust or anything that may interfere with it. Maybe even replace cable. Andres |
#3
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Rear Derailleur Catch 22
On Mar 6, 5:32 am, Robert Lee wrote:
My rear derailleur doesn't shift cleanly. If I increase the cable tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. Sounds like inner wire/housing/under BB guide issues. Replace the crappy 4mm housing with good 5mm, new inner wire, clean the BB guide and...bob's yer uncle. |
#4
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Rear Derailleur Catch 22
In article ,
Robert Lee wrote: My rear derailleur doesn't shift cleanly. If I increase the cable tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. I had this problem once with a touring bike and a Shimano XT 8-speed derailleur. I think the flexibility of the chain was the critical issue. I could find a setting for proper shifting in both directions only when using a Shimano chain. It didn't work with a Sram/Sedis chain. Even with the Shimano chain, the adjustment had to be right within half a turn of the adjuster screw. Some years later I tried Sram chains again and they now worked. Perhaps a new chain (less flexible?) would help in your case? |
#5
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Rear Derailleur Catch 22
"Ned Mantei" wrote in message ... In article , Robert Lee wrote: My rear derailleur doesn't shift cleanly. If I increase the cable tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. I had this problem once with a touring bike and a Shimano XT 8-speed derailleur. I think the flexibility of the chain was the critical issue. I could find a setting for proper shifting in both directions only when using a Shimano chain. It didn't work with a Sram/Sedis chain. Even with the Shimano chain, the adjustment had to be right within half a turn of the adjuster screw. Some years later I tried Sram chains again and they now worked. Perhaps a new chain (less flexible?) would help in your case? Or a sloppy upper derailleur pulley, but I doubt that since the bike is only 8 months old. My bet is on a dirty, sticky cable. Do you use by any chance a Nokon cableset? I experienced that same behaviour with that set. They use a too soft liner, causing a small amount of hysteresus in the system. Lou |
#6
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Rear Derailleur Catch 22
On 2007-03-06, Robert Lee wrote:
My rear derailleur doesn't shift cleanly. If I increase the cable tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. Probably the cable as Qui si parla said, but I wonder if this could also be caused by the cassette lockring being loose. |
#7
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Rear Derailleur Catch 22
My rear derailleur doesn't shift cleanly. If I increase the cable
tension, the derailleur doesn't shift cleanly outward; if I decrease the tension, it doesn't shift cleanly outward. I've tried different settings on the b-tension screw, but to no avail. Is there a solution? The bike is eight months old. I have a ten- speed Shimano Dura Ace rear derailleur with a 12x27 Ultegra cogset. Everything else is Ultegra. How many miles on the chain? If close to 2k, could be time to replace it. If the chain isn't worn but is dirty, clean & lube it. Also check the derailleur hanger alignment. Could be that it's bent in slightly. And, as others have mentioned, check for kinds in the cable housings, especially right where they enter the ferrules. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#8
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Rear Derailleur Catch 22
could be the initial tension is too high when fixing the cable to the
deray, and at that time the cable adjustor is an incorrect position in relation to that tension. the deray itself is in the correct position when fixing, right? the deray can be disassembled and regreased. it wasn't properly greased as designed when it left the factory. take a look inside. use the marine castrol from wal-it resists water runout |
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