Originally Posted by
geepondy
Thanks for the sage advice thus far. Another issue is the frame size. The available bike is 54cm and at 5'10", I think 56cm is more suitable. My friend said you can compensate for frame differences somewhat by changing the stem, etc.
Definitely don't buy it if it is too small. Unless you have particularly short arms then a 56 cm is likely to fit you much better. The only thing in favour of the Roubaix in smaller sizes is the relatively high stack. If you prefer a bit more saddle to bar drop then you might just get on with the 54 cm frame. But only if the reach is still long enough for you and it might well not be.