Will gears need adjusting after crank change?

thecremeegg
thecremeegg Posts: 284
edited March 2011 in MTB workshop & tech
Got my new cranks coming tomorrow and was wondering if changing the crankset and bottom bracket will have an effect on the gearing? The rings are the same size and everything so I'm assuming that it should all be ok?
My Enduro S-Works

Comments

  • nicklouse
    nicklouse Posts: 50,675
    it might do it might not.

    more info needed TBH.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cooldad
    cooldad Posts: 32,599
    Once the new cranks are on it will be obvious if any adjustment is needed.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • thecremeegg
    thecremeegg Posts: 284
    Ok well I'm changing from my square taper BB and alivio crankset to an SLX one. I only ask as the bike is due in the shop to have its gears sorted tomorrow and it'll have the old stuff on it.
    My Enduro S-Works
  • nicklouse
    nicklouse Posts: 50,675
    so are you changing the chain line?

    if yes then yes.

    it depends on what is fitted. more info needed.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • thecremeegg
    thecremeegg Posts: 284
    It will be a Hallowtech bottom bracket thats replacing my ancient square taper one so I guess the chain line will change? If so that's annoying!
    My Enduro S-Works
  • cooldad
    cooldad Posts: 32,599
    Just learn to index your gears, 5 minute job, and not one that needs an LBS
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • The Rookie
    The Rookie Posts: 27,812
    If your changing the crankset yourself, re-indexing the gears should be easy, if the LBS are doing the changing get them to index at the same time, its part of the same job.

    Paying an LBS to index your gears is shameful in my opinion, however, don't get them to do it until after youve/theyve chaged the chainset!

    Simon
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • nicklouse
    nicklouse Posts: 50,675
    dont forget the BB shell will need facing.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown

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