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  1. #1
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    I'm 5'11, inseam 32. What size road frame should I buy?

    I am looking at picking up a road bike frame (in particular a Surly Steamroller) and have no idea what size I should buy. Currently I ride a 20" Trek 7300FX but that has different sizing than road bikes. What size should be perfect for me?

  2. #2
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    Quote Originally Posted by lobo
    I am looking at picking up a road bike frame (in particular a Surly Steamroller) and have no idea what size I should buy. Currently I ride a 20" Trek 7300FX but that has different sizing than road bikes. What size should be perfect for me?
    By the way the frame comes in 49, 53, 56, 59, 62cm.

    Thanks!

  3. #3
    2-Cyl, 1/2 HP @ 90 RPM slvoid's Avatar
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    I would guess you're a 55cm.
    Unless the bike only comes in small/med/large, definitely go to a bike shop to size yourself for fit first.

  4. #4
    The Cycling Photographer SipperPhoto's Avatar
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    my guess would be a 55 or possibly a 57

    jeff
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    2-Cyl, 1/2 HP @ 90 RPM slvoid's Avatar
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    Quote Originally Posted by SipperPhoto
    my guess would be a 55 or possibly a 57

    jeff
    Heh wouldn't that mean he's the average of 55 and 57, or 56

  6. #6
    Senior Member halfspeed's Avatar
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    Quote Originally Posted by lobo
    I am looking at picking up a road bike frame (in particular a Surly Steamroller) and have no idea what size I should buy. Currently I ride a 20" Trek 7300FX but that has different sizing than road bikes. What size should be perfect for me?
    Is that inseam the length of your Levis or your true inseam (pubic bone to floor)? That can vary quite a bit.

    I assume you know that the Steamroller is designed as a fixed gear bike. The intended use is not the same as a road bike and may not be sized the same way. You should also ask in the single speed/fixed forum. Intended use can make a big difference in sizing. A road racer will tend to want a smaller frame because it is stiffer and lighter while a distance rider would want a bigger frame that's more comfortable.

    Furthermore, differences in geometry and whether or not the frame is measured center-to-center or center-to-top can make a difference in sizing. Also, if aren't real bendy any more (happens with age) you'll need to go bigger.

    Frame sizing is far less scientific than many would have you believe. You can search for information all over the web and find theory after theory after theory and refutations for all of them.

    The bottom line is that you are anywhere from a 56 to a 60 depending upon the frame, your actual measurements, your flexibility, how you want to ride, and what you consider more important (weight, strength, durability). I ride 'em big, so the 55 seems on the small side by my reckoning. In fact, my single speed is a 63 and I'm only 3/4" taller than you. My preferred size is a 61, though.

    But I don't really know anything. I'm halfspeed.

  7. #7
    Senior Member 55/Rad's Avatar
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    Go to www.wrenchscience.com and go through their fitting program. Make sure your measurements are as accurate as possible. The answer you get there will be closer than any we can provide here. Then go a LBS to see how different manufacturers size their bikes. Also, take the time to learn and understand the geometry of the different types of frames.

    It's the first step but it's very important. Don't skimp on this process or you could regret it for as long as you own the bike.

    55/Rad

  8. #8
    The Rabbi seely's Avatar
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    I would put you on a 55 most likely... my guess is the 20" Trek is a bit large for you. I have almost a 34" inseam and ride a 19" with aggressive XC geometry, 56cm roadbike with traditional (non compact) geometry. I think you would be better off with the 56 though than the 53. It depends on the bike though, different manufacturers take their measurements from different points on the bike.

  9. #9
    pluralis majestatis redfooj's Avatar
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    59.... hell, im exactly 175cm (5'8.5") and ride a 61 and it fits me perfect

    i do have some tall legs, tho.. with 83cm which should be around your height

    anyways, every online estimator ive used have recommended a 56 (even a 55) but i fit great on my 61.

  10. #10
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    I'm the same height as you (5' 11") but my inseam is a little over 34" and I ride a 58cm (C-T) frame. I'm guessing a 56cm would fit you. I'm supposed to have a long torso, but you seem to have an even longer one relative to your legs. The problem with having a long torso is that a lot of racing bike frames (especially those modeled after the "Euro bike" geometry) might not have a long enough top tube to fit you, unless you use a really long stem and fidget with your seat position. You don't want to get a frame with a short top tube that will force you to ride in an excessively scrunched-up position. Everyone's body geometry is a little different and I think the best way to find out what's best for you, as some have already mentioned, is to get fitted by a good bike shop with knowledgeable people.

    -Kevin

  11. #11
    05 Roubaix Comp Double
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    See,everybody is guessing,you cant.
    Touch every 3rd person and you'll find an idiot.

  12. #12
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    Quote Originally Posted by lobo
    By the way the frame comes in 49, 53, 56, 59, 62cm.

    Thanks!

    Lobo your size should be the 56cm bike. My measurements are 5'10 inseam of 32. I was fitted for a 56cm Trek 1000 at my LBS who specializes in Trek bicycles. Being you are only an inch taller than me your frame size should still be 56cm (just have your seat adjusted). If you are not sure, go to your LBS and get measured.

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