I'm new here, but I've been reading several of the archived threads and have learned quite a bit. I recently purchased a bike off CL - a chromoly Miyata SportCross hybrid (I believe it's the 1991 model after flipping through the Miyata catalog). Everything on the bike is original, including the tires. The tires are advertised as 700x35c.
The tire says "37-622 (700x35c)". This is the first point of confusion. Based on Sheldon Brown's tiring sizing page, I thought 700x35c would be called 35-622, not 37-622. What's the difference?
Next, I removed the tire and tube. The tube and rim strip actually say "28 x 1 5/8 x 1 3/8". I don't see such a fractional number on Sheldon Brown's page, though I do see a "28 x 1 5/8 x 1 1/4" that he says is "Northern European designation for the 622 mm (700 C) size". I'm not sure how this corresponds.
The real purpose of this exercise is to determine the thinnest tires the rim will accommodate. The inner width measures 17mm, so, again, based on Sheldon Brown's page, it sounds like I can put 700x25c or 700x28c tires on this. Is this correct? Also, will I notice any appreciable difference by changing from 35c to 28c tires?
Thanks for any help.