Can't get indexing to work properly when changing from an 8 speed to 9
10-28-22, 01:42 PM
#1
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Can't get indexing to work properly when changing from an 8 speed to 9
Old hybrid bike, a KHS. It had an 8 speed rear wheel, triple on front, and broken shifters. I had a nine speed cassette and 9 speed shifters so I traded them out. Tried to tune up the rear but no matter what it would skip, jumping from position 3 to 4. If I adjusted tension to address that issue then it won't shift properly elsewhere.
What I have done:
-checked limits and they are fine
-checked for bent derailleur hanger, it is fine
-tried a different cassette, still a problem. That cassette and chain are new.
-tried a different 9 speed wheel, same problem with that wheel
-tried different set of 9 speed shifters, still the same problem
-checked frame alignment using "string" method. No indication that it is out of alignment.
The only thing I didn't do is go back to an 8 speed as I have no 8 speed shifters.
Any thoughts?
[Edit: I did replace all cables and housing]
What I have done:
-checked limits and they are fine
-checked for bent derailleur hanger, it is fine
-tried a different cassette, still a problem. That cassette and chain are new.
-tried a different 9 speed wheel, same problem with that wheel
-tried different set of 9 speed shifters, still the same problem
-checked frame alignment using "string" method. No indication that it is out of alignment.
The only thing I didn't do is go back to an 8 speed as I have no 8 speed shifters.
Any thoughts?
[Edit: I did replace all cables and housing]
Last edited by goldfinch; 10-28-22 at 01:53 PM.
10-28-22, 01:47 PM
#2
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Replace the cable? Perhaps a kink in the cable so anything you run with a shift at that cable location has issues?
Just a guess but it's an easy fix and if I'm wrong, oh well, you just did a routine tune-up ahead of schedule. (Edit: could be the housing also.)
Just a guess but it's an easy fix and if I'm wrong, oh well, you just did a routine tune-up ahead of schedule. (Edit: could be the housing also.)
10-28-22, 01:52 PM
#3
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I should have said that I replaced all cables and housing.
10-28-22, 01:55 PM
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Did you check the derailer hanger alignment?
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10-28-22, 01:55 PM
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Is everything the same brand?
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10-28-22, 02:10 PM
#6
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When systems index perfectly except for a single mid-range position, you have to focus on variables specific to that. It could be an issue with the shifter cam being off or dirty, so maybe it'll resolve. Otherwise, I'd consider that chain length (and/or) B screw are off from ideal. That can place the jockey wheel too close or too far from the sprocket at that particular position.
Since you seem to have another 9s bike, try the problem wheel on that bike to rule the cassette out, Next, carefully observe the jockey wheel to sprocket distance where it shifts poorly and try using the B-screw to change that.
If it is the cassette (shifts off on the other bike, you can address the shifting problem by micro-shimming that one sprocket. Cut out paper spacers soaked in oil work fine for that purpose.
Since you seem to have another 9s bike, try the problem wheel on that bike to rule the cassette out, Next, carefully observe the jockey wheel to sprocket distance where it shifts poorly and try using the B-screw to change that.
If it is the cassette (shifts off on the other bike, you can address the shifting problem by micro-shimming that one sprocket. Cut out paper spacers soaked in oil work fine for that purpose.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 10-28-22 at 02:13 PM.
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10-28-22, 02:31 PM
#7
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When systems index perfectly except for a single mid-range position, you have to focus on variables specific to that. It could be an issue with the shifter cam being off or dirty, so maybe it'll resolve. Otherwise, I'd consider that chain length (and/or) B screw are off from ideal. That can place the jockey wheel too close or too far from the sprocket at that particular position.
Since you seem to have another 9s bike, try the problem wheel on that bike to rule the cassette out, Then carefully observe the jockey wheel to sprocket distance where it shifts poorly and try y=using the B-screw to change that.
Since you seem to have another 9s bike, try the problem wheel on that bike to rule the cassette out, Then carefully observe the jockey wheel to sprocket distance where it shifts poorly and try y=using the B-screw to change that.
Thanks. I think it might be the B screw. Even screwed all the way in the jockey wheel is quite far from the cassette. Chain size seems fine, I sized it my usual way. Anyway, off to run errands, will try a different der when I get home.
10-28-22, 02:32 PM
#8
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Old hybrid bike, a KHS. It had an 8 speed rear wheel, triple on front, and broken shifters. I had a nine speed cassette and 9 speed shifters so I traded them out. Tried to tune up the rear but no matter what it would skip, jumping from position 3 to 4. If I adjusted tension to address that issue then it won't shift properly elsewhere.
What I have done:
-checked limits and they are fine
-checked for bent derailleur hanger, it is fine
-tried a different cassette, still a problem. That cassette and chain are new.
-tried a different 9 speed wheel, same problem with that wheel
-tried different set of 9 speed shifters, still the same problem
-checked frame alignment using "string" method. No indication that it is out of alignment.
The only thing I didn't do is go back to an 8 speed as I have no 8 speed shifters.
Any thoughts?
[Edit: I did replace all cables and housing]
What I have done:
-checked limits and they are fine
-checked for bent derailleur hanger, it is fine
-tried a different cassette, still a problem. That cassette and chain are new.
-tried a different 9 speed wheel, same problem with that wheel
-tried different set of 9 speed shifters, still the same problem
-checked frame alignment using "string" method. No indication that it is out of alignment.
The only thing I didn't do is go back to an 8 speed as I have no 8 speed shifters.
Any thoughts?
[Edit: I did replace all cables and housing]
10-28-22, 04:40 PM
#9
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10-28-22, 06:22 PM
#10
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Please list all components' Brands and Models... there is a mismatch somewhere and that info will help us identify that mismatch. Example:..A 9 speed CHAIN differs from 6-7-8 Speed chain... And i've seen a worn Rear Derailleur cause what you describe... also causes reluctance during Downshifting.
10-28-22, 06:23 PM
#11
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10-28-22, 07:27 PM
#12
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Ok, solved with different derailleur that allowed me to get a better B screw adjustment. Thanks everyone. I learned a lot with this particular problem. The deraiileur I had put on the problem bike works fine on another bike so I do think it was a B screw problem.
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10-30-22, 06:20 PM
#13
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Glad it's working now!
Last edited by maddog34; 10-30-22 at 06:25 PM.
