1. The most important thing about buying a new bike is to make sure it fits. The only way you'll know if the bike is right for you is to size up the bike and make sure that the bike's geometry matches your body's geometry. Ask questions and do some research.
mtn. biking 101
2. If possible, try to find a shop that will let you demo the bike on real dirt. Five minutes in a parking lot won't cut it. You wouldn't buy a car without a real world test drive, and a bike should be no different.
3. Don't belive the hype. Just because your favorite rider or best friend rides a certain bike, that doesn't mean that's the best one for you. Have an open mind and be realistic about your needs and ability.
Results 1 to 3 of 3
  1. #1
    mtbr member
    Join Date
    Apr 2006

    Finding bike size?


    I have a 90something Trek 930 and Specialized Hard Rock

    How would i find out what size these 2 bikes are? the Specialized is smaller then the Trek for sure.

    I am 5'9 and the Trek just seems too small

  2. #2
    mtbr member
    Join Date
    Apr 2006
    I assume I am too measure center to center
    This is my results of my 2 bikes

    The Trek seems much bigger then the Specialized but they both are 16's from my measurements?

    References I used for names, not sure if these are what they are typically called.

    Trek 930 (Cro-Moly)
    A) Top Tube - 21
    B) Down Tube - 24
    Ca) Seat Tube - 16
    Cb) Seat Tube welded post - 1.5
    Dx) Stem height - 4
    Ey) Stem Length - 5.5

    W) Derailleur - Altus A10
    X) CrankSet - Altus A10
    Y) Brake Pads - No good labels
    Z) Shifter - Altus A10

    Specialized Sport Hardrock GX (Cro-Moly)
    A) Top Tube - 21.5
    B) Down Tube - 24
    Ca) Seat Tube - 16
    Cb) Seat Tube welded post - 1
    Dx) Stem height - 5
    Ey) Stem Length - 6

    W) Derailleur - Shimano AceraX
    X) CrankSet - Shimano AceraX
    Y) Brake Pads - Shimano Altus
    Z) Shifter - Shimano? MRX100-71?

  3. #3
    Reputation: Bikinfoolferlife's Avatar
    Join Date
    Feb 2004
    Bike sizes are usually expressed via a seat tube measurement; some measure center-top, some center-center. Not sure what you mean by welded post on your seat tube measurments...
    "...the people get the government they deserve..."
    suum quique

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