Increase in rotor size - Avid BB7's- Mtbr.com
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  1. #1
    Big Paws on a Puppy!!
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    Increase in rotor size - Avid BB7's

    If I wanted to move from a 160mm rotor to a 180mm rotor with BB7 brakes is it just a matter of buying new rotors and adapters or is the BB7 caliper size specific as well?

    Thanks!
    ‎"My bicycle masters boardwalk and quagmire with aplomb." - Tom Nuttall

  2. #2
    mtbr member
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    I believe it is as simple as getting just the proper size adapter for the size rotor. Make sure that you get the correct one for your fork also, there are 2 different kinds of mounts. Adapters dont usually come with the longer bolts needed, so you have to buy longer bolts that go with the adapter.
    Big Foot Blue KHS XC704r

  3. #3
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    Ratman, you just need the correct adaptor for the rotor size & if the adaptor is for the front &/or rear caliper (& if I.S. or post-mount). You can use the same mounting bolts you have now. Make sure the washers are oriented correctly when you install the adaptors.

  4. #4
    mtbr member
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    ^Are you sure? They do sell different length bolts.
    Big Foot Blue KHS XC704r

  5. #5
    bike-zilla
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    i have several different adaptors of different sizes and manufacturers, and i dont remember ever having to get different bolts. Most seem to come with both sets of hardware- caliper to bracket and bracket to frame/fork
    also avid uses a 185mm rotor, not 180mm which is mostly shimano stuff. Make sure to get a 185mm avid rotor and 185mm adaptor. You can use other brands of rotors but the surface area isnt always the same. I used a 203mm shimano rotor with my bb7's for a few rides and it left a groove in my pads from the rotor surface being a different width

  6. #6
    bike-zilla
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    whoops, double post...

  7. #7
    2010 RockHopper Comp Disc
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    Make sure your fork can handle the upgrade.

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