How does dropout position affect reach/stack?- Mtbr.com
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  1. #1
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    How does dropout position affect reach/stack?

    I've just sold my spitfire because I found it too small (6ft1 on a large) in the lowest dropout position, and smaller than the geo numbers suggest. When riding it in the highest position the bike felt much longer from a sizing perspective, but ruined the handling.

    Out of curiosity are there figures on how much the reach/stack changes depending on the dropout position? I'm looking at moving to the size up but I'm worried it'll be too long from looking at the figures, but again if the bike shortens in the slacker settings it could be spot on.

  2. #2
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    It will change reach / stack considerably.
    For my Phantom in XL using a 140mm fork instead of 120mm will take off ~8mm of reach.
    From your desription I would say sizing up is perfectly fine for you.

  3. #3
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    Just sketched it up.
    going to slack will do this:
    reach: -5mm
    stack: +4mm

  4. #4
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    Are the reach/stack figures from the med/high position to start with? I did have a play with a couple of geometry calculators and the numbers add up when in the high position, so that results in -10 reach in the slack setting, which with the low stack makes for a much shorter bike that suggested.

    It would be really awesome if separate geometry charts existed for each setting. I'm also hoping the 2016 spitfire is longer from the rumors.

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