The Surly ExtraTerestrial tire is one of our favorite tires for hard-packed surfaces like paved roads, rail trails, and firm gravel roads. This tire has a round profile with a narrow contact patch. We've had customers ride these tires on multi-day tours on varied surface roads. They're also a favorite on rail trails like the Flint Hills, Prairie Spirit, or Katy Trail. The tire comes in various sizes.
The ExtraTerrestrial tire was meant 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.