chain rubbing

chatlow
chatlow Posts: 850
edited April 2013 in Workshop
hi I noticed over the weekend that my chain rubs when using the 39/13 gear combo. I have a 39/50 at the front and 13/26 t the rear. It is rubbing against the inside of my big 50 gear i guess due to the angle. any suggestion. Dont really want to have to adjust the front mesh as its shifting pretty well but will if i cant use those gears together anymore!

Comments

  • sungod
    sungod Posts: 17,504
    it's best to avoid using the two largest sprockets when on the big ring and the two smallest sprockets when on the small ring

    using small-small, chain rub is very likely, the angle the chain runs at also causes extra stress and wear
    my bike - faster than god's and twice as shiny
  • chatlow
    chatlow Posts: 850
    so this is a fairly common issue then? happy to avoid using those gears if needs be. would only adjust if an easy quick fix

    thanks
  • sungod
    sungod Posts: 17,504
    the common term for using the big-big or small-small combinations is 'cross chaining', if you google you'll find plenty on the topic
    my bike - faster than god's and twice as shiny
  • CYCLESPORT1
    CYCLESPORT1 Posts: 471
    Keep the chain "in line" as stright as possible, they don't like working sideways.
  • k-dog
    k-dog Posts: 1,652
    Yeah, you don't want to be doing that.

    Using the 50t on the front and a 16 or 17 on the rear will give you almost the same gear anyway.
    I'm left handed, if that matters.
  • chatlow
    chatlow Posts: 850
    thanks all. will stay away from the 53/13 combo and work around it.
  • dennisn
    dennisn Posts: 10,601
    chatlow wrote:
    thanks all. will stay away from the 53/13 combo and work around it.

    No, no wait. It's more than OK to use 53-13 or 53-12. Shouldn't be any chain rub anywhere with a 53 tooth front ring unless it rubs on the front D(which it shouldn't) or you're using it on one of the larger 2 or 3 cogs(23 to 27?) in the back which you shouldn't do. Also the smaller ring in the front should not be used on the 2 or 3 smallest(11-12-13-14) cogs in back. This MAY cause what some call "chain dink". It's happens because the angle of the chain causes it to sometimes touch the large ring.
  • k-dog
    k-dog Posts: 1,652
    ^but 13 is his smallest cog so it is the one (and probably the next one too) that he should avoid.

    There is a little confusion whether the front is a 50 or bigger - obviously it's more common to have 52/39 than 50/39 - but the angle to the smallest cog is the issue rather than the size of it.
    I'm left handed, if that matters.
  • dennisn
    dennisn Posts: 10,601
    k-dog wrote:
    ^but 13 is his smallest cog so it is the one (and probably the next one too) that he should avoid.

    There is a little confusion whether the front is a 50 or bigger - obviously it's more common to have 52/39 than 50/39 - but the angle to the smallest cog is the issue rather than the size of it.

    He was saying he should stay away from 53-13, yet that's what he should be using. Maybe I'm a little confused? Wouldn't be the first time.
    Big ring for small back cogs.
    Small ring for big rear cogs.
  • k-dog
    k-dog Posts: 1,652
    You're right, I misread that - looks like he meant to say 39/13.
    I'm left handed, if that matters.

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