I like that All City.
I have few older steel bikes although none made from Reynolds 531.
Couple of older Fuji bikes one is my oldest bike (1972), 3 late 80's Schwinn bikes, a 80's Nishiki and a 80's Nashbar triple triangle.
The Fuji Finest or the Schwinn Tempo are probably the lightest, but being well over 200 pounds I don't sweat bike weight that much, I'm more worried about whether it is comfortable to ride.
Paul, I'm guessing you don't have any bikes with friction downtube shifters huh?
