I've been learning a lot over in the classic & vintage section, but am totally new to the fixed gear world. I've got a couple of early 70's Schwinn fillet-brazed Super Sport frames, that I thought about converting to 6 or 7 speed commuters.
But now I'm thinking about saving even more weight by turning at least one of them into a fixed-gear rider. So, I guess my first (of probably many) question might be what size front ring and what size rear ring would a 210 lb. rider want for a mostly flat terrain? He is young (my son-in-law) and probably considered pretty aggressive, speed-wise.
Thanks in advance for any advice on this!