hey, a quick question on sizing for the redline 925. i've looked at the charts quite a bit but would like to get further confirmation...

is the "50" size comparable to a 54 (medium) in a brand like specialized (for bike, say the allez or langster)? the TT's seem to be similar length though the redline is a physical measurement and Specialized uses a horizontal measurement. both would have a 50cm physical seat tube measurement. if it helps, i am 5'8' and have a 31 inseam. just looking to get some insight from someone who rides one.