XT Brake mount for 2012 Spearfish- Mtbr.com
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  1. #1
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    XT Brake mount for 2012 Spearfish

    Hi guys. I recently replaced the stock Avid brakes on my 2012 SF 2 with XT. The problem is that the stock rotor that comes on the front wheel on this bike is a 170, which seems to be a non-standard size. The mechanic who put the brakes on for me used the mounting kit for a 180 rotor, so the brake pads do not completely line up with the rotor. The bike still stops just fine, but I am only using about 3/4 of the front brake pad. Does anybody make an XT brake mounting kit for a 170 mm rotor? Thanks.
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  2. #2
    NedwannaB
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    Quote Originally Posted by mikeridesabike View Post
    Hi guys. I recently replaced the stock Avid brakes on my 2012 SF 2 with XT. The problem is that the stock rotor that comes on the front wheel on this bike is a 170, which seems to be a non-standard size. The mechanic who put the brakes on for me used the mounting kit for a 180 rotor, so the brake pads do not completely line up with the rotor. The bike still stops just fine, but I am only using about 3/4 of the front brake pad. Does anybody make an XT brake mounting kit for a 170 mm rotor? Thanks.
    Why not just get a 180 rotor?:/ Serious question.

    And while I'm at it, I assume yours is the pre split pivot model. If you are running a 2x setup can you post a shot of the front derailleur? I have an '11 and am looking for the right one.
    Ripley V1 XC/Gravel Adventure rig
    Ripley V4 UpDowncountry rig

  3. #3
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    XT Brake mount for 2012 Spearfish-20150727_103228%5B1%5D.jpg

    Here's the pic of the front der. I guess it would make sense to get a 180, but I was thinking a mounting bracket would be cheaper than a rotor and the 170 works just fine. Thanks.
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  4. #4
    NedwannaB
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    Thanks for pic. Mine is green model that has the charcoal rear triangle. The asymmetric stays are what's causing issue with lowering and using my 3x der that's on it now.

    As for rotor wasn't being a wiseacre just haven't come across a 170 rotor. If it works no need to fix but it will work better with full pad contact!
    Ripley V1 XC/Gravel Adventure rig
    Ripley V4 UpDowncountry rig

  5. #5
    It's carbon dontcha know.
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    Get a new mechanic.

    At some point once your pads have worn sufficiently the overlapped parts of the pads will touch before the rotors have been squeezed sufficiently to slow you.

    At which point you'll no longer have a functioning front brake.
    Rolling on 29", 650b, 8.3" and 23mm

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