I live in an area with steep savage rolling hills that vary from 1/8 to 1 mile long. Up and down. Up and down. No flat spots ever. I can hit speeds of 35mph or even 40mph going downhill. My biggest fear is a tire blowout at max downhill speed. I'm so old it would probably put me in the hospital. So, the only thing I want is a very dependable wire rim tire that won't come off the rim if it blows at high speed. Lately I've been using Michelin tires. 25mm wide.