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  1. #1
    Senior Member laterider's Avatar
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    mountain bike sizing

    I have a question about mountain bike sizing. I'm just not sure how to compare them (if you can) to road sizing. I've been riding road bikes since the beginning of the year and have two, one is a 53cm and the other is a 54cm. I guess they are both considered mediums.

    I've been looking at treks and they have sizes like 16" and 18", just don't know how to compare to road, where should I start? I'm 5'9" - 30" inseam. Any inputs would be appreciated. I can't believe after getting two bikes this year I'd want another, but I'm getting sortof hooked (lost 25lbs this year). I don't know how riding MTB would fit into my fitness plan (if I really have one), but it sure looks like fun!

    Thanks in advance..

  2. #2
    MTB Patriot
    Join Date
    Apr 2005
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    Junction City, Kansas
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    Trek 3700, 2005 model year
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    I have a 21.5" Trek and a 34" inseam. I think an 18" would work based on your measurements but a good Local Bike Shop (LBS) will be a good place to go try a few and get a good recommendation.

    As far as a fitness plan - if it's fun, you'll do it more and that in itself, is a plus for your fitness.

  3. #3
    Junior Member
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    Imagine whats gonna happen if you fly off your bike while going downhill and you land on your crossbar. Thats why you want more space. I ride the same size road bike as you and prefer a 17" bike, but not all manufacturers have equal sizing. Try before you buy.

    Joe

  4. #4
    Senior Member
    Join Date
    Oct 2004
    Location
    Montreal, Quebec
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    Litespeed Ultimate 2006, Litespeed Pisgah , Specialized Roubaix 2008, Trek Madone 2011
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    I have 3 road bikes and I bought a Specialized Stumpjumper this spring. It is my favorite ride and single track will make parts ache that you didn't even know you had.

  5. #5
    Senior Member
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    I asked the same question at my LBS today. I have a 56 cm Madone, they said to start with a 17.5 mountain bike, or a Medium??

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