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Old 07-26-10, 09:51 PM   #1
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Name that size!

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

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Old 07-26-10, 10:10 PM   #2
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It's either 56 or 58cm.
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Old 07-26-10, 10:32 PM   #3
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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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Old 07-26-10, 10:48 PM   #4
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another vote for 58cm.
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Old 07-26-10, 10:59 PM   #5
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I say 58cm.
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Old 07-26-10, 11:07 PM   #6
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58cm-ish.
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Old 07-26-10, 11:09 PM   #7
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58cm
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Old 07-26-10, 11:59 PM   #8
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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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Old 08-02-10, 06:14 AM   #9
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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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Old 08-02-10, 06:52 AM   #10
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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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Old 08-02-10, 01:14 PM   #11
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I'll split the difference and say 57cm.
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Old 08-02-10, 02:48 PM   #12
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On my monitor, it's about 3 inches... maybe 2.87.
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Old 08-02-10, 02:59 PM   #13
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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"?
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Old 08-02-10, 04:04 PM   #14
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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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Old 08-02-10, 05:08 PM   #15
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60cm and too small for me...

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Old 08-02-10, 06:17 PM   #16
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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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Old 08-02-10, 06:42 PM   #17
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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.
But maybe we have calibrated eyeballs...

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Old 08-02-10, 10:14 PM   #18
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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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Old 08-02-10, 10:32 PM   #19
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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.
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Old 08-03-10, 12:00 AM   #20
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those are definately 26" rims
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Old 08-03-10, 07:07 AM   #21
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Well what's the answer?
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Old 08-03-10, 08:56 AM   #22
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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.
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.
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