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Old 09-29-11, 12:15 PM   #1
Drummerboy1975
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How does Cannondale measure their frames?

Do they measure from the top, middle, or bottom or the BB? Then where to?
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Old 09-29-11, 01:22 PM   #2
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I think the 80s ones were from center of the BB to top of the seat tube, including the extension.
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Old 09-29-11, 01:25 PM   #3
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My '91 3.0 frame is a "56cm" and measures 56 from the center of the BB to the top of the seat post. Center to center is approx 54cm
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Old 09-29-11, 01:25 PM   #4
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Ok, thanks guys.
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Old 09-29-11, 01:30 PM   #5
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I have a 1987 R500(63cm). It measures 66cm from center of BB to top of seat tube.

From top of BB to top of seat tube is 63cm... if that means anything
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Old 09-29-11, 01:33 PM   #6
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Hmmm... Interesting.
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Old 09-29-11, 01:35 PM   #7
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Originally Posted by Drummerboy1975 View Post
Hmmm... Interesting.
So what is the measurement on your bike?

Here is the 87 catalog. The frame sizes are broken down here if you scroll down.

http://66.147.244.179/~vintagm8/year/1987/1987.pdf

Last edited by Roger M; 09-29-11 at 01:45 PM.
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Old 09-29-11, 01:46 PM   #8
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they measure by how many beer cans they need to stack up to make the seat tube
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Old 09-29-11, 03:10 PM   #9
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The serial number contains the size of the frame as well so if you have a frame already see what the size is supposed to be and then see which measurement corresponds with that.
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Old 09-29-11, 04:16 PM   #10
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Drummerboy1975, My '89 crit bike is a 56 cm frame and measures 56 cm from the center of the BB spindle to the top of the top tube.

Brad

PS My bike is pretty much spot on using the 1990 Cannondale catalog.

Last edited by bradtx; 09-29-11 at 04:24 PM. Reason: ps
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Old 09-29-11, 04:25 PM   #11
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they measure by how many beer cans they need to stack up to make the seat tube
Not just any beer can, B'Girl, but aluminum beer cans with the pull off tabs.

Brad
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