There's about 1/4" clearance between the fork and a 23mm tire on a 700c rim. A little more on the back. So I think it's 700c.

The standover height with said rims and tires is about 35".

The SR cranks now reside on my fixed gear. I took them for a ride and they feel great. I'd been looking for a cheap way to get 175mm cranks on the bike.