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  1. #1
    XDR
    XDR is offline
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    Brake Pad/Rotor Contact Area

    Just swapped to some new style SLX/XT brakes with Ice Tech rotors and noticed the brake contact area isn't the same front to rear. The front is a 180mm rotor, with adapter it looks like the pad makes perfect contact, 1mm of gap at the top of rotor and 1mm at the bottom of the contact area. On the rear is a 160mm rotor, it appears that the pad is too far out on the rotor and there is a ~3mm space on bottom of rotor.

    My question is do I shave the post mount on the rear to bring the caliper closer to the center line or is this placement ok? I did a 12 mile test ride today and didn't notice any issues with function. The bike is a Giant Anthem 29er.

    Here is a picture of the front, then a picture of the rear.

    Brake Pad/Rotor Contact Area-null_zpsbf4b6cd9.jpg
    Brake Pad/Rotor Contact Area-null_zps441ad910.jpg

  2. #2
    Biking Like Crazy!
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    XDR, is there a IS brake adaptor being used to mount the brakes to the frame. If there is you can grind or file that down to bring the caliper further down.
    Just be careful to make sure you keep things square. If the caliper mounts directly to the frame via post mount, then I wouldn't mess with it.
    Niner RIP9
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  3. #3
    XDR
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    It is a frame post mount. I just pulled the pads and it looks like the pad is making full contact with the rotor, so no overhang.

  4. #4
    Biking Like Crazy!
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    Quote Originally Posted by XDR View Post
    It is a frame post mount. I just pulled the pads and it looks like the pad is making full contact with the rotor, so no overhang.
    I guess you're good then. Not much I can think of to correct that.
    What brakes were you using before, and how was the pad contact on the rear?
    Niner RIP9
    Niner WFO 650B
    Knolly Chilcotin
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  5. #5
    XDR
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    It had OE Avid Elixir 5s on it, but those used the conical spacers/hardware whereas Shimanos directly mount. Pad contact on those was perfectly centered.

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