Hi, I just put a new 9sp shimano cassette & chain on and still have and old SuntourSR chainset that I ripped of a halfords bike cos I did'nt have anything else and I needed to get back in action. Anyway - I now have terminal chainsuck on the granny ring and it jumps on the middle ring. The chain I took off was terribly worn and I think it ate the chain rings quite badly. The question is - is the chainsuck due to the fact that I'm using an 7sp chainset with a 9sp chain or because the chainset is well worn ?
Also, can I get away with a Deore front mech (44-48 teeth spec) with a 52 tooth front chain ring ?
news.virgin.net said the following on 05/02/2008 17:34:
Quoted message said:
Hi, I just put a new 9sp shimano cassette & chain on and still have and old SuntourSR chainset that I ripped of a halfords bike cos I did'nt have anything else and I needed to get back in action. Anyway - I now have terminal chainsuck on the granny ring and it jumps on the middle ring. The chain I took off was terribly worn and I think it ate the chain rings quite badly. The question is - is the chainsuck due to the fact that I'm using an 7sp chainset with a 9sp chain or because the chainset is well worn ?
Entirely possible. A 9-speed chain is quite narrow, and a 7-speed chainring is quite thick. Chain suck is caused when the chain, for whatever reason, doesn't release from the bottom of the chainring. In this case, the reason is that the chain is too tight on the teeth. This is the width of the teeth, not the fact that they've worn.
Quoted message said:
Also, can I get away with a Deore front mech (44-48 teeth spec) with a 52 tooth front chain ring ?
Try it and see! In theory it shouldn't work very well, but a front mech is a pretty crude device. Just make sure it clears the big ring easily over the whole length of the cage.
"Pete Biggs" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
Paul Boyd said:
Entirely possible. A 9-speed chain is quite narrow, and a 7-speed chainring is quite thick.
7 and 9 speed chains have the same *internal* width and are compatible
with
Quoted message said:
the same chainrings.
~PB
So the chain suck is due to worn chain rings ? They seem to be made of aluminium and I would have thought a worn chain could have eaten them really quickly, though I rarely use the small ring.
I just put a new 9sp shimano cassette & chain on and still have and old SuntourSR chainset that I ripped of a halfords bike cos I did'nt have anything else and I needed to get back in action. Anyway - I now have terminal chainsuck on the granny ring and it jumps on the middle ring. The chain I took off was terribly worn and I think it ate the chain rings quite badly. The question is - is the chainsuck due to the fact that I'm using an 7sp chainset with a 9sp chain or because the chainset is well worn ?
I use 9sp chains throughout now. On a 7sp the reduced width has stopped it getting jammed between ring and frame. I think lighter weight has fundamentally reduced whip anyway and made shifting better.
In article <[email hidden]>, news.virgin.net [email hidden] says...
Quoted message said:
Hi, I just put a new 9sp shimano cassette & chain on and still have and old SuntourSR chainset that I ripped of a halfords bike cos I did'nt have anything else and I needed to get back in action. Anyway - I now have terminal chainsuck on the granny ring and it jumps on the middle ring. The chain I took off was terribly worn and I think it ate the chain rings quite badly. The question is - is the chainsuck due to the fact that I'm using an 7sp chainset with a 9sp chain or because the chainset is well worn ?
More likely the old chain has raised a burr on the edge of the worn teeth - try running a fine file around the rings. You could also investigate the possibility of refitting them backwards.
