Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Senior Member
    Join Date
    Oct 2003
    Location
    ann arbor, mi
    Posts
    279
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    question about slack in chain/"play" in cranks

    hi, just got my bike finished up last night (old schwinn road frame and various junkbin parts), and went on the "maiden voyage" this morning on the way to work. lots of fun. i dig the simplicity and lightness of my new bike (beats commuting on a big ol mountain bike). but i noticed one thing:

    there's a little bit of "play" in the cranks. by this i mean that if you push up and down on the pedal, or forwards and backwards, you can move the crankandpedal a little bit w/o moving the wheel. it's just a little bit. it's like there's a little bit of slack going from forwards to backwards. just a little. is this just because there's a little slack in the chain?

    and i'm no physicist or anything, but couldn't the slack create more of a force on the rear wheel and cog than if it was perfectly smooooth(is perfectly smooth even possible?). is this bad?

    sorry for all the probably assinine questions.

    dan

  2. #2
    Senior Member shishi's Avatar
    Join Date
    May 2003
    Location
    brooklyn, NY
    My Bikes
    Sparton(custon track), Fuji
    Posts
    1,291
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A little slack is ok. You can tighten up the chain more, but if it makes noise then it is too tight.

    Getting just the right chain tension can be tricky depending on how good your chainline is. Just make sure it isn't too loose.

    Matt

  3. #3
    the way we get by skitbraviking's Avatar
    Join Date
    Sep 2003
    Location
    Wherever the f**k I feel it
    My Bikes
    Cinelli Supercorsa / Surly Karate Monkey
    Posts
    2,719
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the post guys... AS a newbie, it was helpful for me.

  4. #4
    Senior Member auroch's Avatar
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    986
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    if you have a real fixed gear hub w/reverse threading than it shouldn't be a problem. When I was using a converted hub and I had too much slack it was a big problem. Usually you can feel your cog slip a bit and fix it before a catastrophe. and if you're skidding on a converted hub then you're braver than I; which isn't saying a whole lot. keep those lockrings tight.

    jeff

  5. #5
    hello roadfix's Avatar
    Join Date
    May 2003
    Location
    Los Angeles
    My Bikes
    thank you for asking
    Posts
    18,502
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I give about 1/2" max total slack. Just grab chain with your fingers at midway point and pull up & down.
    .cinelli.olympic.surly.long.haul.trucker.kona.ku.surly.steamroller.
    .litespeed.classic.litespeed.firenze.bianchi.pista.dean.colonel.plus.more.

  6. #6
    Senior Member
    Join Date
    Oct 2003
    Location
    ann arbor, mi
    Posts
    279
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by The Fixer
    I give about 1/2" max total slack. Just grab chain with your fingers at midway point and pull up & down.
    ok, so is there any reason for doing this? does it help if the chainline isn't perfect? is it a convenience thing?

    i do in fact have a true fixed hub w/ reverse threads and a lockring and all that. so if i'm not doing any harm to the hub and there's no(or little) risk of things breaking there, my next question is:

    is the slack possibly bad for the knees?

    thanks for all the help so far.

    dan

  7. #7
    shoot up or shut up. isotopesope's Avatar
    Join Date
    Nov 2003
    Location
    colorado springs, co
    My Bikes
    yes please.
    Posts
    1,961
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    the trick i used to get good chain tension on a fixie conversion is this:
    pull the wheel as tightly back as you can into the drops. i then would push the wheel crooked against the chainstays on the non-drive side and tighten that side. i would then push the wheel back into the center of the stays, hold it there, and tighten the drive side. if the wheel was a little crooked still, i would slowly loosen which ever side the wheel was pointing towards and it would then sort of pull the wheel into center, then of course tighten it back up. i absolutely love my chain tensioners for the track ends on my iro. it makes life so much easier.

  8. #8
    hello roadfix's Avatar
    Join Date
    May 2003
    Location
    Los Angeles
    My Bikes
    thank you for asking
    Posts
    18,502
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by hair07
    is the slack possibly bad for the knees?dan
    If you're worried about your knees, just keep your gear inches low.
    A 1/2" chain slack as I mentioned earlier is not noticable while riding. The only time I notice the very tiny amount of 'play' in my cranks due to chain slack is when I'm trackstanding, but this is not annoying.

    George
    Last edited by roadfix; 12-12-03 at 12:04 PM.
    .cinelli.olympic.surly.long.haul.trucker.kona.ku.surly.steamroller.
    .litespeed.classic.litespeed.firenze.bianchi.pista.dean.colonel.plus.more.

  9. #9
    Senior Member
    Join Date
    Oct 2003
    Location
    ann arbor, mi
    Posts
    279
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    thank you everyone. some very good advice. i will try your method isotopesope. sounds like a good way of setting the rear wheel up.

    thanks again all.

    dan

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •