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Thread: Rear triangle geometry question

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    Default Rear triangle geometry question

    A question for builders, if I may:

    For a disc brake equipped road frame, does the chain stay need to be made differently in any way if the rear hub is 142x12mm TA rather than 135x10mm QR?

    Are things like heel clearance any more difficult with a frame built for 142mm TA than it is with that built for 135mm QR?

    I understand that the inside width of the dropouts for both are identical, at 135mm, but I don't know what else could come into play.

    Thanks.
    Chikashi Miyamoto

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    Default Re: Rear triangle geometry question

    if 3.5 mm per side makes a difference, then it might be a problem. However, most TA dropouts are a little thinner at the axle interface. The big difference comes if you have a chain stay mounted caliper, that reduces heel clearance further forward.
     

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    Default Re: Rear triangle geometry question

    I should have added "all else being equal". If both versions have chain stay mounted calipers, then does TA make geometry / shaping more difficult?
    Chikashi Miyamoto

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    Default Re: Rear triangle geometry question

    all things being equal, no. Flat mount would be better than ISO or Post mount on the chain stays, seat stay mount better than either
     

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    Default Re: Rear triangle geometry question

    Quote Originally Posted by Chik View Post
    A question for builders, if I may:

    For a disc brake equipped road frame, does the chain stay need to be made differently in any way if the rear hub is 142x12mm TA rather than 135x10mm QR?

    Are things like heel clearance any more difficult with a frame built for 142mm TA than it is with that built for 135mm QR?

    I understand that the inside width of the dropouts for both are identical, at 135mm, but I don't know what else could come into play.

    Thanks.
    It's probably going to depend on the dropout design so I wouldn't go so far as to say that ALL dropouts wouldn't have a difference but generally speaking, they shouldn't. As an example, comparing Paragon hooded TA drops to hooded 135mm drops, they're in exactly the same place. They're the same width and diameter. The axle is inset into the inside face of the dropout by 3.5mm on each side, so the 7mm difference in the axle width is negated.
    Sean Chaney
    www.vertigocycles.com
    a peek behind the curtain

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    Default Re: Rear triangle geometry question

    Quote Originally Posted by VertigoCycles View Post
    It's probably going to depend on the dropout design so I wouldn't go so far as to say that ALL dropouts wouldn't have a difference but generally speaking, they shouldn't. As an example, comparing Paragon hooded TA drops to hooded 135mm drops, they're in exactly the same place. They're the same width and diameter. The axle is inset into the inside face of the dropout by 3.5mm on each side, so the 7mm difference in the axle width is negated.
    Many thanks, Sean. That's what I had guessed but wasn't sure.
    Chikashi Miyamoto

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