Michelin World Tour. Have a set of 27in x 1 1/4 that have thousands of miles of on and off-road use and they look like they are going to last many thousands more. I've tried much more expensive tires that turned out to be of lesser quality. You can find them for around $25. They are a bit heavy, but seem to roll pretty fast for a fat tire (at the 85psi max) and corner really well on any surface. There is a 700/35 version.