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  1. #1
    Senior Member
    Join Date
    Jun 2012
    Location
    SF Bay Area
    My Bikes
    2012 Specialized Sirrus
    Posts
    1,081
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    Basic fit question

    I have some questions about bike dimensions:

    1. Is it possible to determine the desired effective top tube of a bike with drops if I know the effective top tube of a flat bar bike (Specialized Sirrus 2012 to be precise) that fits me very well? From the way fit is described a formula should be possible right? Does one exist, and how well does it work?

    2. Why doesn't the effective top tube length factor in length of the stem? I mean, if you have keep the same effective tt length and change the stem, everything gets messed up, right?

    3. When trying to determine basic fit, apart from effective TT and standover, what are the other important measurements to consider?

    Context: The goal is to determine a used bike ad on craigslist is worth a test ride. Can't possibly test ride all, but can look up specs online and then try to do a basic match before setting up an appointment.

  2. #2
    Senior Member
    Join Date
    Feb 2011
    Location
    St. Cloud, MN
    My Bikes
    Soma Double Cross DC, Salsa Vaya, Redline D440, '87 Schwinn Super Sport
    Posts
    584
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    1 Post(s)
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    0 Thread(s)
    i am shocked you have not received a thousand responses. I would say although you cant test ride them all you can ride some and that will lead you to the correct size
    I do not claim to be a doctor, scientist, genie, bike magician, good looking, or qualified in any way. The contents of my post are opinions and should be taken as such.

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