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  1. #1
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    How important is frame size for beginners?

    Hi everyone,

    All bike frame size guides I read suggest I get at least a 20'' frame size.

    However, I found a 18'' MTB bike that is well recommended and is on sale at the store. It's a rather cheap bike and is only sold here in Brazil.

    Should I spend more and get a 21'' bike or go with this 18''?

    My measurements:

    Height: 187cm / 6' 1''- 6' 2''
    Weight: 93kg / 205lb
    Inner leg (inseam): 91cm / 35.82''
    Arm length: 68cm / 26.77''
    Top of sternum to floor: 156cm / 61.41''

    Thanks!

  2. #2
    Senior Member RoadTire's Avatar
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    Mar 2012
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    Minnesota
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    '09 Trek 2.1, '75 Sekine, '90 Giant Mtb, Raleigh M20, Fuji Nevada mtb.
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    Short answer is frame size is always important, just not as super-critical for us casual riders. Get the better bike, that is more comfortable when you test ride it. Rough estimate is maybe 1 to 2 inches between your jewels and the top tube. Then also make sure that your torso is at a comfortable angle and you are not leaning on the bars. My guess would be 21 inch.
    FB4K - Free Bikes 4 Kidz. This fall 5000 bikes have been donated and we will have them all set to go by Dec 6. That's 5000 kids getting bicycles for Christmas, just in the Twin Cities.

  3. #3
    The Left Coast, USA FrenchFit's Avatar
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    I'll disagree, especially mountain bikes. I can have a blast on a 17" mountain bike, and I'm 6ft. Smaller MTB bikes are very cool and easy to handle technically. Forget about top bar clearance, that's nonsense.

    Ride it, and if you can climb with leverage without your knees being cramped by the distance to the bars - you're good.

  4. #4
    Senior Member
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    Mar 2012
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    Incheon, South Korea
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    Nothing amazing... cheap old 21 speed mtb
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    I can ride a 52cm frame with the right stem and seatpost or I can ride a 60cm frame. Others might disagree but I don't find frame size critical as long as its within the range you can modify it to fit. 2 inches smaller on an mtb can be a good thing. You want a smaller frame for riding downhill.

  5. #5
    Senior Member hermanchauw's Avatar
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    May 2014
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    GT Zone, 90's Diamondback model unknown
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    I am more comfortable on a 20" wheeled BMX than my old "fitted" 26" MTB.

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