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Thread: Name that size!

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    Name that size!

    Can anyone tell me what size they think this frame is?


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    Peripheral Visionary spock's Avatar
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    It's either 56 or 58cm.

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    17yrold in 64yrold body
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    If you are looking for help in figuring out the size, measure from the center of the crank spindle bolt to the center/top of the top tube.

    If you want guesses, I'll go with 58--solely on the head tube length.

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    Senior Member LesterOfPuppets's Avatar
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    another vote for 58cm.
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    Banned. Mr. Beanz's Avatar
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    I say 58cm.

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    58cm-ish.
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    I'm Carbon Curious 531phile's Avatar
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    58cm

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    Senior Member pablosnazzy's Avatar
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    well, your standard park bench has an overall height of 31 " . based off of the top tube being just under the top of the bench, correcting for angle of picture, and taking into account the length and angle of the shadow cast, if i were to triangulate those figures, i would say the size of the bike is either a grande or venti, no room for cream, thanks.

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    Welp, I'd say 58 then, haha. I was leaning towards 56cm, so I'll take 58.

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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by badamsjr View Post
    If you are looking for help in figuring out the size, measure from the center of the crank spindle bolt to the center/top of the top tube.

    If you want guesses, I'll go with 58--solely on the head tube length.
    Looking at the headtube length, I'd put it at 25" or about 63cm. I measured the crank arm in the picture and assumed a 170mm crank then worked out a ratio of picture length to fit that 170mm crank. Applying that ratio to the frame, I came up with something very close to 63cm.

    The best way to tell is to measure the seat tube, of course.
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    Senior Member BlazingPedals's Avatar
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    I'll split the difference and say 57cm.

  12. #12
    Fat Guy Rolling dcrowell's Avatar
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    On my monitor, it's about 3 inches... maybe 2.87.
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    Let your bike be the tool cranky old road's Avatar
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    Quote Originally Posted by cyccommute View Post
    Looking at the headtube length, I'd put it at 25" or about 63cm. I measured the crank arm in the picture and assumed a 170mm crank then worked out a ratio of picture length to fit that 170mm crank. Applying that ratio to the frame, I came up with something very close to 63cm.

    The best way to tell is to measure the seat tube, of course.
    I like your thinking but a more definitive standard might be the diameter of the wheels rather than the crank length. I wonder if they are 700c or 27"?
    Never try to teach a pig to sing...

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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by cranky old road View Post
    I like your thinking but a more definitive standard might be the diameter of the wheels rather than the crank length. I wonder if they are 700c or 27"?
    Ratios are just about the same. The difference between a 27" rim and a 700 C is only 7mm in real life. On the screen that's almost unmeasurable.

    Here's a 63cm from Craigslist



    Here's ziggy's picture



    and here's a 58cm



    Definitely a 63cm
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    Senior Member wahoonc's Avatar
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    60cm and too small for me...

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    Senior Member CNY James's Avatar
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    i would have said 60-62cm... the head tube is a lot longer than on my 56 cm bikes... & I like cycommute's method, its a little more scientific than eyeballing.

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    Senior Member wahoonc's Avatar
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    Quote Originally Posted by CNY James View Post
    i would have said 60-62cm... the head tube is a lot longer than on my 56 cm bikes... & I like cycommute's method, its a little more scientific than eyeballing.
    But maybe we have calibrated eyeballs...

    Aaron
    Webshots is bailing out, if you find any of my posts with corrupt picture files and want to see them corrected please let me know. :(

    ISO: A late 1980's Giant Iguana MTB frameset (or complete bike) 23" Red with yellow graphics.

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  18. #18
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by wahoonc View Post
    But maybe we have calibrated eyeballs...

    Aaron
    I actually have calibrated eyeballs (I knew the head tube was too tall for a 58) but I just wanted something a bit more empirical to back up the eyeballs
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    17yrold in 64yrold body
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    cyccommute: If your pics of the 63cm and 58cm are 'normal' size, then the OP's pic MAY be a 59 or 60, but there seems to be quite a bit of difference in head tube length in the 63 pic and the OP's pic.

  20. #20
    Senior Member zachdees's Avatar
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    those are definately 26" rims
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  21. #21
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    Well what's the answer?
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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by badamsjr View Post
    cyccommute: If your pics of the 63cm and 58cm are 'normal' size, then the OP's pic MAY be a 59 or 60, but there seems to be quite a bit of difference in head tube length in the 63 pic and the OP's pic.
    There is some variance between manufactures on headtube length (lots of it actually) but the main thing to look at is that the headtube on ziggy's picture is much longer than the 23" bike I posted. Look at the seatstays and how high the top tube is in relation to the rear wheel. Ziggy's is much closer to a 25" than the 23".

    I wouldn't try this, by the way, with a sloping top tube bike. But old horizontal top tube frames are pretty easy to eyeball the size...especially big boys like this one.
    Last edited by cyccommute; 08-03-10 at 09:00 AM.
    Stuart Black
    Solo Without Pie. The search for pie in the Midwest.
    Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
    Days of Wineless Roads. Bed and Breakfasting along the KATY
    Twisting Down the Alley. Misadventures in tornado alley.
    An Good Ol' Fashion Appalachian Butt Whoopin'.

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