andytheflyer
Guru
- Location
- South Cheshire
Hi,
Just replaced a SRAM 11-34 9 spd cassette and unknown chain with the Shimano 9spd 11-34 Alivio HG30 and KMC 9 spd chain - only because they were beginning to get tired and it was time to change. Done 200 miles since change. Rear mech is a Deore long cage. All worked fine before I changed cassette and chain. New chain has same number of links. Changed cable inner, lubricated, cable is free and mech also free and well lubed. Whole assembly is in VGC, clean and thoroughly maintained. Not been dropped and bent since new cassette fitted. Shifters not changed. Chain mickled regularly. Cable outer not changed - so cable alignment not changed either.
Despite seemingly getting the cable tension correct (I've changed a few cassettes and chains over the years) it skips with increasing frequency in the 26-30-34 sizes. Tweaking the cable tension makes no difference. No tight links in the chain that I can see, chain joined with KMC missing link. Operation is perfect in the sizes smaller than 26t.
It's a 'bike bent so chain angle front to rear (i.e big front to small rear etc) probably not relevant and anyway the problem is the same despite whichever front ring is in use - the rings are miles away from the cassette!
With no load the mech changes sweetly, no clicking, not ghost shifts. Only when I'm riding does the problem become manifest.
I can't find anything wrong. Anyone got any ideas please?
Just replaced a SRAM 11-34 9 spd cassette and unknown chain with the Shimano 9spd 11-34 Alivio HG30 and KMC 9 spd chain - only because they were beginning to get tired and it was time to change. Done 200 miles since change. Rear mech is a Deore long cage. All worked fine before I changed cassette and chain. New chain has same number of links. Changed cable inner, lubricated, cable is free and mech also free and well lubed. Whole assembly is in VGC, clean and thoroughly maintained. Not been dropped and bent since new cassette fitted. Shifters not changed. Chain mickled regularly. Cable outer not changed - so cable alignment not changed either.
Despite seemingly getting the cable tension correct (I've changed a few cassettes and chains over the years) it skips with increasing frequency in the 26-30-34 sizes. Tweaking the cable tension makes no difference. No tight links in the chain that I can see, chain joined with KMC missing link. Operation is perfect in the sizes smaller than 26t.
It's a 'bike bent so chain angle front to rear (i.e big front to small rear etc) probably not relevant and anyway the problem is the same despite whichever front ring is in use - the rings are miles away from the cassette!
With no load the mech changes sweetly, no clicking, not ghost shifts. Only when I'm riding does the problem become manifest.
I can't find anything wrong. Anyone got any ideas please?
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