Slightly bent outer chainring.

robb_o
robb_o Posts: 332
edited August 2010 in MTB workshop & tech
I've just replaced all 3 chainrings as I found a spare set in my shed.
The biggest "outer" chainring seems to have a slight bend in it when the cranks are spinning. It doesn't cause any performance issues really. Must of got bent when it was sat in my shed for years having stuff thrown on top of it. It literally must only be a couple of mm out.

Just wondering if anyone has any good techniques for getting it straight again?

Comments

  • cavegiant
    cavegiant Posts: 1,546
    A vice and a hammer.
    Why would I care about 150g of bike weight, I just ate 400g of cookies while reading this?
  • Buckled_Rims
    Buckled_Rims Posts: 1,648
    Place it on a kitchen unit top and try and judge where the bend starts. Use a marker pen to mark the high point and then use a vice and hammer :wink:

    Or place the ring in between 2 pieces of wood and tighten the vice.
    CAAD9
    Kona Jake the Snake
    Merlin Malt 4
  • robb_o
    robb_o Posts: 332
    Am I going to weaken the chainring in any way by bending it back?
    I don't think we've got a vice at home, so could I put it between 2 bits of wood on the floor and whack the top bit of wood with a mallet?
  • .blitz
    .blitz Posts: 6,197
    Mole grips & pliers?

    If you're concerned about weakening it, I get worried when those hairline stress marks start to appear. I hit a rock once and took several teeth off the outer chainring but it still worked OK.

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