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Frame sizing(4 posts)

Frame sizingtmotz
Nov 26, 2002 6:38 PM
LBS using BikeFit puts me needing a 60cm road bike so would a 58 cm cyclocross bike be a good fit.Giving I need extra clearance on a cyclocross frame compared to a road frame.
Good question . . .Look381i
Nov 27, 2002 5:38 AM
I have been discussing the sizing issue with Cyclocross World. I ride a 54x55 (c-c), 120 mm stem road bike. Their recommendation is to maintain the tt length, shorten the stem by 1 or 2 cm and keep about the same standover, which gives me only about 3 cm clearance.

Remember that CX bikes have higher BBs which results in a a taller frame for a given st length. Also the tires are fatter, which raises the tt standover. If that isn't confusing enough, a lot of bikes are measured c-t. The Empella frame CW recommended for me was a "57," which has a 53 (c-c) st length and a 54.5 or so tt.
re: Frame sizingjhr
Nov 27, 2002 5:47 AM
According to Simon Burney's book on cyclocross you want a cross frame to be about 1cm smaller both in top tube length and seat tube length.

Personally I ride a 55cm road frame (55cm top tube) but my cross bike (Redline) is a 52cm (53.5 top tube).

Remember standover height on a cross bike will be higher for a given frame size because of (1) higher bottom bracket and (2) bigger tires.

Hope this helps you decide.

jh
re: Frame sizing from a guy your sizeatpjunkie
Nov 27, 2002 4:53 PM
I ride 60-61 x 59 TT roadbikes and have 2 cx bikes.
one a 57 with a 59 TT, the other a 58 with a 59 TT. The 57 has a slightly higher BB abd a little more standover
a 58 should do you fine. If they make a long 57 you can go that small as it's just more room for the goods