6"2 he needs an xl frame, 20" or 21," up to 24" depending on bike brand. each brand is different and has it's own sizing.

at 5'8" a 19" might fit you, but you should be on a medium, 17.5" - 18.5 "

men tend to have shorter legs and longer torsos, women tend to have longer legs and shorter torsos, this needs to be taken into account.

here is a rough guide...

Xtra Small---13"-15" 4'8" to 5'3"
Small---14-16.5" 5'1" to 5'6"
Med---17.5"-18.5" 5'5" to 5'10"
Large---19"-20" 5'9" to 6'1"
Xtra Large 20"-24" 6' to 6'7"

and, sorry to say, no deal is worth a bike that doesn't fit. if the bike doesn't fit, the deal is never too good to pass up.

but you don't have to listen to me, i just work in a bike shop and do this for a living.