Chain not shifting onto inner ring properly

Turnbull2000
Turnbull2000 Posts: 189
edited March 2010 in Workshop
Hi,

Following a bike rebuild and new chain, I'm finding that the chain will occasionally skip over or balance on the edge of the inner ring of my double chain ring. The dérailleur alignment seems ok, so I suspect it may be the chain length. Could the chain be too long?

Comments

  • CarlosDSanchez
    CarlosDSanchez Posts: 455
    It happens when you use a 10 speed chain with 8 or 9 speed chain rings. I think that because the chain is very slightly narrower the ramps and pins on the chain ring are slightly wider to make sure the chain drops on to the middle/smallest ring correctly.

    Might not be that mind, mine did the same at it was using all 8 speed equipment. Did it once or twice and then never again so didn't worry about it.
    Dolan Preffisio
    2010 Cube Agree SL
  • Turnbull2000
    Turnbull2000 Posts: 189
    I'm running a 10 speed set up with double chain ring. Checking my LBS receipt, the chain is listed as "SHIMANO CN-7800 Dur". I believe this is the 10 speed chain?
  • CarlosDSanchez
    CarlosDSanchez Posts: 455
    What chainset are you using?
    Dolan Preffisio
    2010 Cube Agree SL
  • Turnbull2000
    Turnbull2000 Posts: 189
    CarlosDSanchez wrote:
    What chainset are you using?

    I don't think I've been clear in my original post. It's the inner ring of the chainset that the chain occasionally misses. It's a Dura-ace 53/39 double.
  • John.T
    John.T Posts: 3,698
    Incorrect chain length will make no difference. It would affect other things long before the chain rings. Which way is it missing the ring. Overshooting and landing on the BB or riding on top of the teeth. Either way it sounds like a low limit screw problem.
    My Fleet.

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