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Single Speed Chain Slip/Suck

fcumokfcumok Posts: 283
edited May 2010 in MTB workshop & tech
Just converted my hardtail to a single speed. All seems well but when I'm pushing over the top of a hill and putting a lot of power down something will give. I can't replicate it to work out what it is. I currently have the existing deore crank on the 32T ring with the old 9spd chain. I've added a 16T one of these http://bit.ly/auUkrt and one of these chain tensioners http://bit.ly/c2jV27

Can't shorten the chain anymore do I need something like a half link? Or is there a problem with the original crank/chain? Chain line looks good.

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    pics of your set up?

    is the chain straight? how much movement in the chain?
    and which way is the tensioner working?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • fcumokfcumok Posts: 283
    I'll get some pics up in a bit. Chain looks straight. There's a little movement in the chain but if I took another link out it wouldn't fit. Tensioner is pulling down.
  • fcumokfcumok Posts: 283
    Images below:

    th_IMAG0058-1.jpg

    th_IMAG0059-1.jpg

    th_IMAG0060.jpg

    th_IMAG0061.jpg

    th_IMAG0062.jpg
  • fcumokfcumok Posts: 283
    So what do I need to do to fix it? I can't shorten the chain anymore but I guess that could solve the problem?
  • AnonymousAnonymous Posts: 79,667
    fcumok wrote:
    Just converted my hardtail to a single speed.
    Well.... there's your problem :lol:
  • fcumokfcumok Posts: 283
    fcumok wrote:
    Just converted my hardtail to a single speed.
    Well.... there's your problem :lol:

    :D
    Besides the slipping problem it's awesome! :lol:
  • nicklousenicklouse Posts: 50,675 Lives Here
    well the rear cog looks to far out. it needs to be at about cog 5 position, 1 being the biggest.

    try that first.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • fcumokfcumok Posts: 283
    Thanks Nick i'll give that a go. If there's a chain wrap problem would this improve it?
    http://superstar.tibolts.co.uk/product_info.php?cPath=58&products_id=269
  • fcumokfcumok Posts: 283
    Right i've moved the rear cog and still have the problem. I can get it to do it on a hill down the road and it feels as though the chain is slipping although I can't look at it as well as replicate it.

    Thinking about it when I first converted it, it happened all the time until I took a couple of links out so it could still be chain tension. I'm thinking I have two options:

    1. Get a half link for the chain so it'll tension it more although i'm not sure where I can get one from for a 3/32 chain?

    2. Replace the tensioner with one them roller thingys so it's not tensioned by a spring therefore holding the chain tight all the time.

    Thoughts please :D
  • nicklousenicklouse Posts: 50,675 Lives Here
    OK can you run the tensioner the other way IE pushing up?

    Gusset do 3/32 half links.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • lastwordslastwords Posts: 304
    http://www.charliethebikemonger.com/page44.htm

    Watch video at the bottom of the page may help with chain tension by using his method of getting more tension
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