The Surly ExtraTerrestrial 26 x 2.50" is a tough, adventure-ready tire built for long-distance touring and bikepacking on varied terrain. Its tubeless-ready casing and folding bead keep weight manageable while offering the benefits of lower pressures and fewer flats. The tread pattern is optimized for both pavement and dirt, with a low-resistance center line and grippy edges for control on rough roads. This is your go-to tire when you're rolling fully loaded into the unknown.