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  1. #1
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    New question here. Disc Brakes: Rotor hitting caliper - how to adjust?

    Hi folks! New member here from northeast Massachusetts. Been a BMX'er most of my life, recently picked up my first "real" MTB and am really enjoying it.

    I have a bit of a novice question that I'm hoping someone can help me out with. This is my first bike with disc brakes and I'm not entirely sure how to remedy this - I've read up on how to adjust them horizontally, but I have a different problem - the disc itself is hitting the caliper. The brakes are Avid Elixir 3s, and the front is 180mm.

    Here are a few pics - the rotor is hitting the caliper on the upper side:

    (Big pics, so not embedded)

    http://i.imgur.com/ZT8jmao.jpg
    http://i.imgur.com/VmavqyU.jpg
    http://i.imgur.com/fJwqpY8.jpg

    I've loosened the posts which seems to give me plenty of side to side adjustment, but I can't quite sort out how to move the caliper upwards a bit. I'm also a complete novice, so it may be that I have to move the wheel itself - so if this is a stupid question I apologize in advance. The bike has about 100 miles on it, and didn't have this issue when I picked it up.

    I'm planning on bringing it to the shop that I bought it from to look at it, but it's Labor Day weekend and it's about a 40 mile drive north of me through tourist hell, so I'm hoping to be able to fix it myself and avoid the traffic over the weekend.

    Any insight would be much appreciated. Cheers!
    // Chris - Boston, MA
    // '13 Cannondale Scalpel 29'er
    // '15 Specialized Fatboy
    Metalguitarist.org

  2. #2
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    Reputation: Saul Lumikko's Avatar
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    Are you sure the adapter is the right size for your rotor and installed the right way around?

    Compared to this pic it looks like you need to flip the adapter 180 degrees: Elixir 9 Trail Hydraulic Disc Brake | SRAM

  3. #3
    rebmem rbtm
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    The 180mm post mount adapter is on the wrong way around, the arrow on it points to the direction that the rotor spins when you ride the bike.

  4. #4
    007
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    b a n n e d
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    Quote Originally Posted by cobba View Post
    The 180mm post mount adapter is on the wrong way around, the arrow on it points to the direction that the rotor spins when you ride the bike.
    This.
    Alcohol may lead nowhere, but it sure is the scenic route!

  5. #5
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    You guys are spot on, thanks! I ended up bringing it to the shop anyway, and they replaced the bracket and gave it the two week new-bike tune-up for me. The bracket is the correct orientation now, and I have plenty of clearance.

    Rotor:

    http://i.imgur.com/w9ESJ5W.jpg

    Arrow (the bike is upside down, heh):

    http://i.imgur.com/9z5UOc8.jpg

    Thanks very much!
    // Chris - Boston, MA
    // '13 Cannondale Scalpel 29'er
    // '15 Specialized Fatboy
    Metalguitarist.org

  6. #6
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    They really should do that after you ride it for two weeks.

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