Sheldon writes:- "Well, they're similar in appearance and size to a modern clincher tire. They were called "HPRR" (High Pressur Road Racing." Actually, the famous Schwinn "Puff" tires were a knockoff of those, though heavier and slower, they had the identical tread pattern.I rode these for several years in the early '60s...they were unquestionably the best clinchers available, nothing else came close". The Dunlops were certainly great tyres but many English clubmen prefered the John Bull Road Sprint for speed.Maybe John Bull's weren't sold in the US? Ray Green, Brighton, England
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