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  1. #1
    My bike was -TWO- Wheels!
    Reputation: summitlt's Avatar
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    how do you know if you can run 205mm rotors?

    soon i am going to convert to disk brakes. And figured since Im spending the money, I might as well get 8" rotors. Im planning on getting Avid mechs. Ive seen that some forks arent able to run the bigger rotor sizes. Why is this? Just liability for the fork? It seems like any fork could run them.

    How do I know if I can?
    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!!!

  2. #2
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    Quote Originally Posted by summitlt
    soon i am going to convert to disk brakes. And figured since Im spending the money, I might as well get 8" rotors. Im planning on getting Avid mechs. Ive seen that some forks arent able to run the bigger rotor sizes. Why is this? Just liability for the fork? It seems like any fork could run them.

    How do I know if I can?
    It seems that manufacturers (apart from Manitou) don't warrant their IS QR forks for anything over 180 mm. The various 20mm forks are OK. As you suggests, I think this is just a liability issue. I have been running 200 mm XTs on Marzocchi, both z4s and Z1FRSLs for about two years without any problems.

    You just need to get the right adapter for your forks.

    Wombat

  3. #3
    My bike was -TWO- Wheels!
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    Quote Originally Posted by Wombat
    It seems that manufacturers (apart from Manitou) don't warrant their IS QR forks for anything over 180 mm. The various 20mm forks are OK. As you suggests, I think this is just a liability issue. I have been running 200 mm XTs on Marzocchi, both z4s and Z1FRSLs for about two years without any problems.

    You just need to get the right adapter for your forks.

    Wombat
    Ok, I have a cheap RST fork right now, but eventually I wil be upgrading the fork to a much better one, and dont want to waste money buying a 6" rotor and wanting a 8" later
    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
    Ok, I have a cheap RST fork right now, but eventually I wil be upgrading the fork to a much better one, and dont want to waste money buying a 6" rotor and wanting a 8" later

    More than likely you'll be fine running the 8" rotor until you get a new fork. Keep in mind that the solidity of the 20mm axle is very nice when running an 8" rotor for future reference.

  5. #5
    My bike was -TWO- Wheels!
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    Thing is with a 20mm axle, is that kinda lowers my choices of cheap hubs...

    Ill just keep an eye on my skewers
    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!!!

  6. #6
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    Prices on 20mm hubs have come down. You can get a new Marz 20mm hub for like $60 or $70 US. Cheaper than that on ebay.

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