Broken rear mech?

Lagavulin Posts: 1,688
edited September 2008 in Workshop
While I was putting rubbish in the bin my bike fell over and landed on the rear mech.
Checked things over, realigned the brakes etc, wheels seem to be running true.
However, when it came to a climb as I went up through the block the shifting was jumping about all over the place from about the 16t sprocket up and higher than that and it jumped over the cassette into the gap between the block and spokes.
Ruined a pair of gloves doing so but eventually got it free and in a high gear got home.

Using this handy video I've been trying to adjust the gears. He does it in less than 7 minutes where I've been unsuccessful in a little over two hours.
I've had the gears running fairly well but then in after a period in the 25t it's jumped over again and the mech looks a little twisted.

I'm having to order a new pair of long-fingered gloves. New rear mech too or can they be bent back into shape?


  • It may be the gear hanger thats bent if so gently bend back, if its the mech then I would say its had it. There is a tool you can buy that fits onto the mech then rotate checking the orientation in relation to the wheel.
  • Gary D
    Gary D Posts: 431
    It is more likely that the rear mech hanger is bent (that is assuming you have one!). Is the problem on the Wilier or the Spesh?

    I had the same problem on my daughters bike - she had obviously dropped it on its side at some stage - and it threw out the indexing quite badly. I managed to straighten that one by holding on to the mech and gently bending it back until the mech looked vertical. It wasn't actually bent that much. However, that is an aluminium frame. I definitely wouldn't recommend that on a carbon frame. For what it costs, I would be tempted to just by a new hanger.

    Hope this helps,

    Oh and I feel like I've been raped by an Orangutan :shock: And I've got legs like Girders :lol:
  • Lagavulin
    Lagavulin Posts: 1,688
    Thanks for the replies. I'll give it another look over tomorrow.
    Is the problem on the Wilier or the Spesh?
    Allez. If it'd been the Wilier I'd of been too tearful to type.
  • Lagavulin
    Lagavulin Posts: 1,688
    I bent the rear mech and/or it's hanger back a bit this morning and the shifting, with a bit of fiddling with the stops and indexing, is much better*.

    It's not perfect - it's different than before, I've a better chainline to outer chain ring (not that I used the 53T much :oops:) - but it's a big improvement. This morning was too good a day to waste so I went out on the good bike while I could.

    * It's taken a bigger whack than I thought. As it was on the 25T on the inner chain ring the rear mech was virtually scraping the spokes. :shock:
  • robbarker
    robbarker Posts: 1,367
    You need to get one of these: ... item=DAG-1

    Any decent LBS will have one.

    I share your pain - there's nothing more infuriating than spending ages trying to get indexing set up properly. Hope you get it sorted out without too much grief.