OK, I gotta bite - virtually all of the "good" bikes I remember back in the day had "28" inch tubulars which is 700C in modern parlance. And most gaspipe specials had 27". Not univerally true of course. My Panasonic is a decent bike and has 27" wheels but it's a touring bike and 27" was common for that usage. I also started a thread a while back asking whether anybody knew of any frames made in separate sizes for 27" vs. 700C and nobody said they knew of any. I'm not a Schwinn guy but did Paramounts not come with tubulars? And if there was an option between, say 28" tubulars or 27" clinchers (I think there was), was there actually any difference in the frame or fork? Sorry but I'm skeptical that there is such a thing as a frame designed for 27" wheels.

My Bottecchia came with 28" tubulars and it now runs 700C clinchers and if anything they look too big (primarily because they're sized for a 200-lb middle-aged guy instead if a young 165-lb racer )