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Would I need a different sized colnago?(6 posts)

Would I need a different sized colnago?thatsmybush
Apr 28, 2002 3:53 AM
I have a trek oclv 54cm with a 10cm stem. Would it go w/o saying that if I purchased an ovalmaster that I would need a 54cm frame. I have heard that the measurement is different. I am looking to achieve the same top tube and stand over, my inseam is 31 in.
yes...C-40
Apr 28, 2002 4:42 AM
The Trek frame has an advertised standover of 30.3 inches, with a 54.5cm top tube and 74 degree seat tube angle. Colnago's in this size range have the same seat tube angle as the Trek, so a direct comparison of top tube lengths can be made.

A 53cm Colnago will have a standover of 30.6 inches with a 53.5cm top tube. A 52cm Colnago will have a standover height of 30.2 inches with a 53.1cm top tube length. Either frame would require a longer stem, which is no problem, since you are using a relatively short stem now. I would advise carefully rechecking your standover clearance and compare the head tube length of these two Colnago sizes (116 & 107mm respectively) with the head tube length of your Trek to determine which would produce the best fit. If you select a frame that's too small, you'll end up with an ugly stack of spacers under the stem, or a high-rise stem that's not too cool.

I place boards or magazines under the wheels to block up the bike to take a standover clearance check. The measurement should be taken in bare feet, wearing cycling shorts or underwear. Block up the wheels until you get saddle-like pressure in the crotch when you straddle the top tube. The thickness of the blocks is your standover clearance and the distance from the floor to the top of the top tube is an accurate inseam measurement that you should record for future use.
good adviceJohnG
Apr 28, 2002 5:08 AM
Yeah, I suspect you will best fit on a 52-53 cm frame.

Keep in mind small Colnagos have relatively long "effective" TT lengths so be carefull about getting a "too large" frame. Try to shoot for an 11 cm stem length if possible.

good luck
JohnG
simple...colker
Apr 28, 2002 5:38 AM
translate 31in in centimeters, then multiply by 0.67. the result is your c-t ideal frame. c-t is how colnagos are measured.if you think you need more sto clearance than your recommended size, get a sloping tt tube model. (which colnago doesn't build)
too simple...C-40
Apr 28, 2002 6:02 AM
The formula will get you in the ballpark, but careful inseam measurement and head tube length comparison as I've described will insure a more precise selection.
re: Would I need a different sized colnago?DINOSAUR
Apr 28, 2002 7:24 AM
This shouldn't be a problem if you purchase from a authorized Colnago dealer. Take the time to have a fitting, matter of fact, insist on one. And if they won't do a fitting, find another dealer. It's all about fit (been there done that)...