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  1. #1
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    Is it possible to downsize the rotors?

    So, I have a bike with IS/IS brake mounts, and brakes that also come with IS mounts. No problems there.

    However, the brakes are meant for 180 front/160 rear rotors and that is how it works without any adaptors. But I'm fairly lightweight (60ish lbs) and I don't need rotors that big for XC. So, I know I could easily use adaptors to go up a size or two, but is it at all possible to use smaller rotors on this setup or would it require a whole new set of brakes?

  2. #2
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    I doubt it if its IS-IS. However, I have seen this...someone flipped a 203mm IS to Post adapter upside down for 140mm action.
    Mosaic Flipped A 203mm Brake Caliper Adapter Upside Down For Use With A 140mm Front Rotor. Photos | Cyclingnews.com.

    Really though, just try the 180s and 160s and avoid the hassle. I doubt you'll have a problem with too much brake.

  3. #3
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    Re: Is it possible to downsize the rotors?

    Thanks for the reply! That's what I thought, but I wanted to make sure that there wasn't some piece of information missing that would make this a simple and straightforward swap.

  4. #4
    rebmem rbtm
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    Quote Originally Posted by discohospital View Post
    I'm fairly lightweight (60ish lbs)
    I'd say that you're extremely lightweight.

  5. #5
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    Re: Is it possible to downsize the rotors?

    Gosh, my bad. My brain farted mid-kg to lbs conversion

  6. #6
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    I'm similarly lightweight (60kg/130 lbs) and even I enjoy the benefits of 180 up front. Give it a try, I doubt you'll find you are over-braked. (180/160 on my XC bike, 180/180 on my full suspension bike).

  7. #7
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    Oh yeah, if you're 60 kg (like me) 180/160 is fine. That's what I run currently although I'm changing to 203/180 cause I like aggressive brakes and also for aesthetics.

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