Grand Bois, thanks. Good to know.

I'm seeing a vintage Maillard track hubset on eBay, 122 mm OLD, with 15T and 22T cogs. Used with the existing 52T (? I'll verify tonight) big chainring, which would let me flip from 93 GI to 64 GI. With the existing 42T (?) small chainring, would be 76 GI or 52 GI. Does that sound like a workable set of choices for a fixed gear in Portland? I'm sort of attracted to keeping the Maillard high-flange "look" and using sort-of-matching-vintage parts.

(If I can use the existing crankset and avoid buying a track crankset or a whole new wheelset, that will help the budget. I have some MA40 rims laying around, alternatively I've seen used tubular rims quite cheap at CityBikes. I now think I should leave the original wheelset alone for later reconversion back to geared.)