Last night I did the final assembly on my custom single-speed conversion. Over the weekend I stripped the frame and re-painted it, including detailing the lugs by hand. I kept the original fork, stem, pedals, and brake calipers.
Everything else I replaced, with:
-- Sugino 75 track cranks, chainring, and bottom bracket
-- SRAM single-speed chain
-- 18 tooth rear cog with a Wheels Mfg. single-speed spacer kit
-- 700c Mavic MA-2 rims, Shimano freehub
-- Ritchey Tom Slick city / touring tires
-- Race Face MTB flat bar w/ Specialized grips
-- BMX 2-finger brake levers
-- CCM Pro retro vintage seat
I rode it to work today and it was soooo smooth! Rides like a dream now. The steel frame handles NYC streets so well, better than my aluminum Trek.