triple chainset probs

Dr M
Dr M Posts: 171
edited March 2009 in Workshop
got a triple fitted when i bought my bike in the summer but cant seem to get the middle ring and large sprocket combo to work properley. I've checked the position of the mech and the indexing + trimming adjustments but when i use this combo (middle ring + large sporcket) i seem to get some kind of chainsuck.

Anything else i should check or think about. The whole drivetrain is pretty new (6 months) but has sort of been like this since i got it. Unfortunately i dont live near the shop i got it from anymore so am trying to work out whats wrong myself before i take it to my new local shop!

I've never had this problem on any other bike with a triple (all been mountain bikes though)

Comments

  • Jamey
    Jamey Posts: 2,152
    This may not be the answer you're looking for but it's not a given that the middle ring will work with all gears. Both of the bikes I've had were triples but on my old bike I was able to use every sprocket while the chain was on the middle ring however on my new bike the chain rubs at the extreme ends of the cassette and I have to use the big or small chainring if I want to make use of the largest or smallest sprockets, respectively.

    I know that chain suck isn't the same as chain rubbing but maybe it's still being caused by you asking too much of the drivetrain, perhaps?
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  • Dr M
    Dr M Posts: 171
    yeah i thought that might be the case, just wondered why i'd never had problems on mountain bikes before. Unless its because the 10 speed chains are thinner and not sure if cassette is wider than the 9 speed on the mountain bike.

    Its not a major hassle i just wondered if there was anything i'd overlooked in my search for drivetrain perfection!
  • Jamey
    Jamey Posts: 2,152
    Well I'm not saying it isn't a problem because I don't know, I'm just saying that sometimes, on some triple-ring bikes it's not always possible to use the whole cassette in the middle ring, that's all.
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  • John.T
    John.T Posts: 3,698
    The MTB has longer chain stays so the chain runs straighter on the extreme gears.
    My Fleet.
  • pbracing
    pbracing Posts: 231
    John.T wrote:
    The MTB has longer chain stays so the chain runs straighter on the extreme gears.

    :) Thanks for that. I've always wondered why road tripples suffer with the above problem and mtb's don't. It's made my day knowing this. I only wish I hadn't spent so many hours over time trying to get road tripples perfect.
    ( I can't have wondered that hard btw if I never looked into the causes :) )
    Why not? My bikes.
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