Problem changing up with Ultegra

Al2y
Al2y Posts: 21
edited January 2011 in Workshop
When changing up thru rear cassette it is sometimes delayed. Other times it doesn't change up at all, however when I go to change up again it goes up 2. Doesn't seem to be any problem down shifting. Anyone had this problem?

Comments

  • desweller
    desweller Posts: 5,175
    Contaminated cables mate. A regular winter refrain. Will be especially pronounced in very cold conditions as any water in the cables will freeze and cause additional friction.
    - - - - - - - - - -
    On Strava.{/url}
  • ADIHEAD
    ADIHEAD Posts: 575
    Actually I've got 2 bikes with Ultegra, Ironically the winter bike is ok when cables, transmission are clean, but it does play up otherwise. The other for some reason cannot be indexed properly (looked at by 2 bike shops!) unless the cable and chain are almost brand new, and that's the dry weather bike! Each time I replace chain and right hand cable it improves, then gradually deteriorates. I just put up with it and give the lever a second nudge when necessary and it's fine. I had no problems with 9sp Ultegra at all and like I say, my winter bike is fine as long as everything's clean.

    So give it a clean, if the cables have done a year or so in mixed weather then swap inner and outer right hand cable. And possibly fit a new chain. Other people I know have Ultegra and it works great so think it's down to the cable routing, or a possible slight lack manufacturing tolerance in the STI.

    All comments are for 6600 btw
  • Al2y
    Al2y Posts: 21
    Thanks for your help there lads. Will get on to replacing that cable and chain.
  • ADIHEAD
    ADIHEAD Posts: 575
    edited January 2011
    No worries. Suppose you know the one about changing cassette also if the chain is worn by 1% or more? If it jumps when you crank on the pedals hard after fitting new chain, then it's a cassette as well :cry:
  • desweller
    desweller Posts: 5,175
    Hey ADIHEAD

    It's a bit weird I know but sometimes shops cut the outer cable rear loop to the derailleur a bit short. The tight radius can create the rapid degradation you describe. Try lengthening it a bit - say 20mm or so.
    - - - - - - - - - -
    On Strava.{/url}
  • ADIHEAD
    ADIHEAD Posts: 575
    Had considered that actually but then decided I was being silly :roll: . I did replace the rear loop, but copied the exact original length though so gives me an excuse to buy some more cables and get the cutters out :D
  • marin_maniac
    marin_maniac Posts: 513
    DesWeller wrote:
    Hey ADIHEAD

    It's a bit weird I know but sometimes shops cut the outer cable rear loop to the derailleur a bit short. The tight radius can create the rapid degradation you describe. Try lengthening it a bit - say 20mm or so.

    I've got Ultegra 6700 and can confirm that the rear loop deffo makes a difference. I like you copied the OEM loop and only when I lengthened it so there is a straight run to the barrel adjuster on the rear mech, it shifts sweet.
  • ADIHEAD
    ADIHEAD Posts: 575
    Cheers guys and that's something 2 LBS's didn't suggest. Will have a go when I can be bothered as won't be riding that bike for at least 6 weeks :cry:
  • marin_maniac
    marin_maniac Posts: 513
    ADIHEAD wrote:
    Cheers guys and that's something 2 LBS's didn't suggest. Will have a go when I can be bothered as won't be riding that bike for at least 6 weeks :cry:

    If it's any consolation, the mate who I bought my bike off works in a bike shop and couldnt get it shifting correctly which included cutting the rear loop to short when he changed the cables before I bought the bike!

Categories