Surly Extra Terrestrial 650b x 46 Tubeless Tire Just like how you wouldn't underestimate a space alien's powers and intelligence just because he is small and green, the same holds true for the Surly Extra Terrestrial Tire; There is a lot more than what meets the eye. The Surly Extra Terrestrial 650b x 46 Tubeless Tire features low rolling resistance, tread and sidewall flat protection and great traction on hardpacked trails. The large and flat directional tread pattern allows for ultra-low rolling resistance, making for a tire that likes to go fast on the road or the trails. The ET uses a nylon breaker in the sidewalls for cut protection, a molded pattern on the sidewall for anti-cut propagation, and a Kevlar cap under the tread to protect against flats. The Surly Extra Terrestrial 650b x 46 Tubeless Tire is a great all-around tire and is truly out of this world. Features Tightly spaced, large, flat block tread design Rolls fast and smooth. Tread and sidewall flat protection 60TPI SPECIFICATIONSSize650b X46Bead Clincher, folding TPI60Compound-Protection Tread and sidewall Tubeless Compatible Yes Intended Use Touring, cross-country Approximate Weight685g | Surly | Extraterrestrial 650B X 46 Tubeless Tire | Black | 60Tpi, 650B X 46, Tubeless, Folding | Nylon