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  1. #1
    mtbr member
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    160mm rear rotor - Speedfox SF02

    Stock rotors are 185mm with the Elixir 3s

    The bike is a 2012, owned and soon to be raced by a NorCal high school kid. We want to lighten it up a bit for XC racing with a weight weenie wheelset and downsize all rotors to 160mm. He weighs about 140lbs so 160s should be fine for most of his riding.

    I took a quick look at the rear caliper mount and it appears that it does not have an adapter and that the caliper is mounted directly to the frame. Does anyone know if this frame will accomodate a 160mm rotor size and if so what specific adapter to get for the Elixer/160mm rotor combo?

    This is his specific model - Speedfox SF02 SF02 XT-SLX - Mountainbike

    He absolutely loves the bike by the way!

    Thanks for any info -
    FT
    Last edited by fat.tires; 02-04-2013 at 04:00 PM. Reason: changed the 180mm to 185mm

  2. #2
    bikerpilot
    Reputation: tootall's Avatar
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    If you could post a picture from the brake side that would help. If the caliper is mounted directly to the frame I'm not sure you can downsize the rotors, but I don't think that's the case.
    BMC FS01 29 X0
    Redline Monocog 29
    Jamis Supernova
    Rocky Mtn Flow DJ

  3. #3
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    Will do, I'll take a photo this afternoon.

  4. #4
    bikerpilot
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    Also, check this out. http://cdn.sram.com/cdn/farfuture/aw...mounting_0.pdf

    It details the different types of frame/fork mounts, calipers, adapters, etc., and spells out the different combinations and which adapters are needed for each.
    BMC FS01 29 X0
    Redline Monocog 29
    Jamis Supernova
    Rocky Mtn Flow DJ

  5. #5
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    Picture of current caliper mount with 180mm rotor

    160mm rear rotor - Speedfox SF02-bmc_rear-brake.jpg

    Thanks tootall, nice find on the Avid spacer/bracket info.

    As you can see from the image it looks like a CPS A Direct mount set of spacers being used for the 180mm (not 185) rotor. I don't think it's possible to go with a 160mm rotor but may bolt one on and remove the 2 lower washer/spacers to see if it will work. doubtful.

  6. #6
    bikerpilot
    Reputation: tootall's Avatar
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    Yeah I'd say you're not going to be able to go to 160 rotors as those look like 180 post mounts. I don't think removing the CPS washers would make enough difference for the smaller rotors, bummer.
    BMC FS01 29 X0
    Redline Monocog 29
    Jamis Supernova
    Rocky Mtn Flow DJ

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