Originally Posted by dijos
It's a 2 parter; I have a 30" inseam, and 36" arms. no, really. So in doing some basic calulations, It looks like I should be riding a 50cm frame. Is that right? it seems so little for someone who's 5'10", and it would mean that I've been riding the wrong size frame for a long time. Also, would a frame that size have a proportionally shorter top tube, thus putting me in a more upright position given the length of my arms? Yes, I know that i'm pretty well out of proportion. Thanks!
Sizing over the internet, especially with odd shaped people, is a crap shoot. Yes, a 50 sounds too small and a 55 to 58 would seem more likely, but frame geometry and rider fitness vary greatly so conclusions based on such limited information are highly suspect.