Surly ExtraTerrestrial Tire - 27.5

Size: 27.5 IN x 2.5 IN
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Ultra-durable and designed for low rolling resistance, the Surly ExtraTerrestrial 27.5 in. tire is meant for heavy off-road touring and shines on hard-packed terrain and multiroad surfaces.

  • Features

    • Low-profile, directional tread pattern maintains traction when you need it
    • Molded tread pattern and a nylon breaker in the sidewalls helps protect against cuts
    • Kevlar® cap under the tread helps protect against flats
    • Recommended rim width is 23–30 mm
    • Surly recommends checking with your rim manufacturer to verify rim and tire compatibility before assembly or use
    • Note: Tire images shown may not reflect size/color/material options available on this page


    View all Surly Road Bike Tires
  • Technical Specs

    Best Use

    Bike Touring


    Wheel Size

    27.5 inches

    Tire Width

    2.5 inches

    Foldable Tires




    Thread Count Casing (tpi)

    60 threads per inch

    Tread Type

    Knobby Tread

    Bead Type


    Recommended Pressure (psi)

    35 pounds per square inch


    1010 grams

    Tire Type

    Tubeless Ready

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