When you’re out on a ride the last thing you want is to be limited by your tires in any way. Surly ExtraTerrestrial 700c Adventure Tires were designed to let you ride without limits. Outstanding design and incredible technology is created by simply following the only tenets we have for tire design mdassh they’re high volume and they kick ass. Designed to serve as a heavy-duty off-road touring tire that shines on hardpack surfaces. It uses a nylon breaker in the sidewalls for cut protection a molded pattern for anti-cut propagation and a Kevlar cap under the tread to protect against flats.