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  1. #1
    Reputation: yboc's Avatar
    Join Date
    Nov 2012

    180 or 200mm rotors up front?

    I'm not very pleased with the Avid 5s on my 2013 Enduro, so I'm going to be upgrading shortly. Either to SLX or XT brakes. Right now they have 200mm up front and 180mm in the rear, and I'm wondering if I should get a 200mm Shimano rotor or 180. I've been riding a lot of fast downhill stuff lately, and the Avids on top of the Avids losing power, theyve been burning up, making a lot of noise and being pretty inconsistent. And I'm losing confidence in them.

    Will I notice a smaller rotor with the SLX or XT brakes? Are those Shimanos a big improvement over the Avids?


  2. #2
    mtbr member
    Reputation: eluv's Avatar
    Join Date
    Apr 2005
    If your not worried about weight go with the largest rotors. Is always better to have too much brakes then not enough. I say pay the extra and get the XT's. I have 180 front and 160 rear XT and the 180 is an overkill for trail riding. With the xt you can dial down the engagement so it does not hit right away. That's what I had to do not spending another 50 bucks for a rotor

  3. #3
    mtbr member
    Join Date
    Aug 2011
    Yes the Shimanos (I have XT, but SLX are like 99% of the same thing) are that much better than Avids (I had 2012 Elixir 5s).

    I run 180 front and rear on my Blur LT, but I'm also a very heavy guy (240+lbs kitted up). I also run the XT ice tech rotors and finned pads. Worked great on a lift serve day at Deer Valley recently, no squeaks, no loss of power, not even stinky pad smell.

    Depending on how aggressive you are, and how heavy you are, I'd either go 180 or 200. Also if bike weight isn't an issue, then just go 200 anyway.

  4. #4
    meow meow
    Reputation: b-kul's Avatar
    Join Date
    Sep 2009
    personally i wouldnt bother to upgrade rotors. i run xt brakes and g2 rotors. great power, no squeak.

  5. #5
    mtbr member
    Join Date
    Feb 2011
    I just did the upgrade from Elixir 7 to XT last weekend on my 29" Stumpjumper FSR. I went with the same 200 up front. The shimano's are head and shoulders above Avid brakes. BTW, Problem Solvers makes a killer adapter if you want to mount your SRAM shifters to your new XT brakes. I used it and it's better than either Matchmaker or I-Spec from either manufacturer.

  6. #6
    mtbr member
    Reputation: nauc's Avatar
    Join Date
    Sep 2009
    id get 180 and 160 XTs

  7. #7
    mtbr member
    Join Date
    Apr 2005
    How much do you weigh? If you're heavier, and riding long/steep downhills, go with the 203mm IceTech rotors up front. I switched from Exlir 7 to XT (203/180) back in the winter, and I love the performance, but I have noticed that I have overheated and discolored the rear rotor on at least one long descent this year. That hasn't happened on the front yet.
    Salt Lake City
    2012 Specialized Stumpjumper FSR Comp 29
    2006 Specialized Allez Expert Double

  8. #8
    mtbr member
    Join Date
    Jul 2008
    I weigh 145lbs and run 203/160 on my trail problem stopping for me. And no, it is not overkill.

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