The Surly Endomorph 26x3.7 27tpi Tire is the perfect rubber choice for your Fat Bike. Designed by Surly specifically to fulfill the needs of Fat Bike riders everywhere, the Endomorph is a high volume, go anywhere, do anything tire. The center portion of the Endomorph’s medium durometer (60a) tread is comprised of widely spaced chevrons made up of small, low-profile knobs. Higher-profile knobs, at the outer edges of the tread, provide cornering traction and lateral stability in the loose stuff. No tread pattern is going to be perfect in every condition, but the Endomorph’s tread tends to perform quite well on a variety of surfaces. Truthfully, the casing volume has as much to do with this tire’s performance as the tread pattern does. High volume allows the use of low pressure without much risk of pinch flats. The use of low pressure allows the tire casing to spread out on the ground, providing greater traction and floatation due to the increased footprint. Surly has run these tires as low as 5 psi in deep snow, but 8-10 psi is generally low enough for most snow and sand riding. Want to ride on harder surfaces? Pump ‘em up to 15 psi, if the surface is hard, but rough or up to 28 psi, if you’re riding pavement or smooth, hard dirt. Of course, this is just a guideline. Trial and error/success is the best way to determine what pressure will best compliment your riding style, trail (or lack thereof) conditions and your weight.
- Designed to fit Surly's Pugsley frame and Large Marge rims
- Will fit other manufacturer's appropriately wide rims
- Designed to be run at very low pressure
- Shallow chevron tread
- Ideal for maximum traction and float in soft conditions, snow and sand
- 10-28psi Recommended Pressure
- 27 tpi
- 94mm (3.7 inch) wide x 740mm (29 inch) tall on Large Marge Rims
- Steel Wire Bead