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For those that ride high- volume, large foot- print bicycles, the tire selection is scarce. Surly created the Endomorph as replacement tires for the Surly Pugsley, however, this tire is used on many high- volume bicycles. The Endomorph tire is 3.7” (94mm) wide and 29” (740mm) tall. It’s one of the highest volume tires out on the market today. The center of the Endomorph’s medium durometer (60a) tread is comprised of widely spaced chevrons made up of small, low- profile knobs. The higher- profile knobs at the outer edges of the tread provide cornering traction and lateral stability for riding on loose dirt or gravel.