Originally Posted by Kurogashi

Is there a problem if it's a tad bit too small? I have a 48cm beater (handy-down) and been using it for almost a year. My arm is approximately 24inch (from shoulder to knuckles.

I just did a quick measurement (approximately +/- 1 inch from each category..) for the fit calculator on competitive cyclist and I got:

Competitive fit | Eddy fit | French fit (this is in cm)
Seat tube range c-c: 47.7 - 48.2 | 48.9 - 49.4 | 50.6 - 51.1
Seat tube range c-t: 49.2 - 49.7 | 50.4 - 50.9 | 52.1 - 52.6
Top tube length : 61.6 - 62.0 | 61.6 - 62.0 | 62.8 - 63.2
Stem Length : 12.9 - 13.5 | 11.8 - 12.4 | 12.0 - 12.6
BB-Saddle Position : 62.8 - 64.8 |62.0 - 64.0 | 60.3 - 62.3
Saddle-Handlebar : 61.2 - 61.8 | 62.0 - 62.6 | 63.7 - 64.3
Saddle Setback : 3.3 - 3.7 | 4.5 - 4.9 | 4.0 - 4.4

According to specialized, the 50cm geometry is:

Size: 50 cm
Stand Over Height: 706mm
Top Tube Length: 525mm
Head Tube Length: 100mm
Head Angle : 72.5°
Seat Angle : 75.0°
Wheel Base : 971mm
Chain Stay Length: 405mm
Front Center : 577mm
Fork Offset : 45mm
Saddle Width : 130mm

What do you guys think? Is a 50cm a 'good' fit?
I guess I should make an appointment to test ride a Caad10 first and then after that, call up this guy and try the e5.