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Front derailleur works, no it doesn't

  • 17-10-2010 10:42pm
    #1
    Harrybelafonte
    Closed Accounts Posts: 6,450 ✭✭✭


    Twice now I've had shop mechanics adjust my front derailleur. Both times it worked perfectly when standing beside the bike turning the pedals by hand, but sitting on the bike I can't shift to lower cog at all and can only get to middle by downshifting twice and upshifting once. Anyone got any ideas what it might be before I bring it back to a shop again?


Comments

  • #2
    DirkVoodoo
    Registered Users, Registered Users 2 Posts: 11,504 ✭✭✭✭DirkVoodoo


    Find a better mechanic. Seriously, I had a similar problem where my front derailleur would shift onto the big ring perfectly when on the workstand but refused to do it cycling. It just took a bit of fine tuning and patience.


  • #3
    Raam
    Registered Users, Registered Users 2 Posts: 14,317 ✭✭✭✭Raam


    Things tend to shift differently under load. Are you easing off on the pedals a bit as you shift or are you still applying a good bit of power?


  • #4
    paddymacsporran
    Closed Accounts Posts: 303 ✭✭paddymacsporran


    Is the cable too slack when on the small cog? It should have a tiny bit of slack, that's all. It could have stretched if it's a new cable fitted.


  • #5
    Harrybelafonte
    Closed Accounts Posts: 6,450 ✭✭✭Harrybelafonte


    DirkVoodoo wrote: »
    Find a better mechanic. Seriously, I had a similar problem where my front derailleur would shift onto the big ring perfectly when on the workstand but refused to do it cycling. It just took a bit of fine tuning and patience.

    In fairness to them I've only made the connection now.
    Raam wrote: »
    Things tend to shift differently under load. Are you easing off on the pedals a bit as you shift or are you still applying a good bit of power?

    Situation is same in both instances, though if applying pressure I can't get it to return to big cog.
    paddymacsporran wrote: »
    Is the cable too slack when on the small cog? It should have a tiny bit of slack, that's all. It could have stretched if it's a new cable fitted.

    No new cable, just quicked fidgeting.

    Thanks guys, I think I'll just bring it back in to the shop and explain situation more clearly.


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