Quote:
Originally Posted by
Fang66 
Does it have a horizontal or sloping top tube? Either way it sounds a bit small.
Quote:
Originally Posted by
HEWSINATOR 
Quick question. Girlfriend's dad owns a small bike shop on the other side of the country. He just sent her a Rocky Mountain Oxygen road bike as a gift. It is a size 51 cm. We have not built it yet but that seems small to me. She is about 5'7, not sure of inseam but at least 30''. Any thoughts?
here's the info on the that bike click on the geometry chart to see the top tube (virtual length).
http://www.bikes.com/main+en+01_102+OXYGEN_30_AC.html?BIKE=594
the 51cm comes out to 53.5 virtual top tube length which works out to be right for someone about 5'7" using the modern competitive cyclist fit (of course its small if you do the french and eddie fits). but this looks to be a modern sloping top tube bike that "requires" a "modern fit".
if you do the competitive cyclist fit calculator it usually has a 53.5cm top tube with a 100mm-110mm stem. Its actually better to have a spare 90cm stem just to start out with (especially people new to road bike positions) so she can ride the hoods comfortably. Then eventually stretch out into a 110 or 100mm stem.
remember its going to fit but with modern fit standards and aesthetics: lots of seat post showing especially with the sloping TT and you'll have a healthy saddle to bar drop (maybe 2" or even 3"). it'll look really "racy".
but if sizing for an old school totally horozontal TT frame (think old school steel frames) and short quill stem (sometimes those old school quills are less than 70mm) you do the French Fit/Eddie Fit.