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Thread: 8" vs. 6"

  1. #1
    My bike was -TWO- Wheels!
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    New question here. 8" vs. 6"

    I saw these two different sets fo disks, here are some questions I have

    Can you use a 8" rotor and caliper on any old bike, or do you need different mounts?

    With mechainical disks, you use teh regular V-brak lever, i know this one does, but do most others also?

    XC Version

    Downhill Version

    Id like the downhill version, since its only $5 more, and Id liek the extra power. So if im getting a non DH bike, can i run 8" rotors?
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  2. #2
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    Quote Originally Posted by summitlt
    I saw these two different sets fo disks, here are some questions I have

    Can you use a 8" rotor and caliper on any old bike, or do you need different mounts?

    With mechainical disks, you use teh regular V-brak lever, i know this one does, but do most others also?

    XC Version

    Downhill Version

    Id like the downhill version, since its only $5 more, and Id liek the extra power. So if im getting a non DH bike, can i run 8" rotors?

    I'm not a real big fan of mechanicals all togheter. I think they're a good brake if you're trying to do a cheap upgrade, but i don't think they offer the same advantages that a hydraulic brake does.

    If i HAD to go with a mechanical, it would be avid mechanical. No others.

    8" rotors generally are ment for sturdy qr20 mounts.. Granted some will say oh you can get away with just a sturdy fork /frame but keep in mind that these 8" disc brakes generate alot of power and weren't designed for your general run-of-the-mill fork.

    Since its a mechanical disc brake, i'm sure it doesn't generate quite as much force as say a hydraulic so i can't speak on if you "need" downhill quality parts for your mechanical..

  3. #3
    My bike was -TWO- Wheels!
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    Ok then

    So they will mount up? It seems like thats what your saying.

    I almost know I dont need them, but it really can hurt can it (other than weight)
    Schwinn Moab DS3 Avids, Rhyno Lites, Speed Dials, Some other stuff.
    Homebrew flat black rigid commuter with a Shockster
    Gary Fisher BMX
    Get Avid Juicy 7's for 65% off!!!

  4. #4
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    Quote Originally Posted by summitlt
    So they will mount up? It seems like thats what your saying.

    I almost know I dont need them, but it really can hurt can it (other than weight)
    If your frame has IS mounts you are set. Hayes uses adapters to mount their post mount calipers - probably about $12 each.

  5. #5
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    Mounting 8" ...check your bike

    for example, many do NOT take a lager rear rotor (ie. older Bullits' rear only take 160mm, new ones 190mm, both short of 8"). Check with your bike maker to find out the maximum size.

    If you ride in wet, and are heavier like 180# or more, put 8" in front, the rear is far less critical, as the front does the stopping mostly.

    Jim MCM #11

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