The rear specific Surly Lou Fat Bike Tire is a good friend to his neighbor Bud. When they go out, Lou lets Bud lead, giving him the spotlight while Lou humbly works to keep their operation moving forward and occasionally bailing his impulsive friend out of trouble. His spacious, 7 millimeter tread is similar to Bud's, built to transfer power over wet, lumpy, and loose terrain however like his personality it leans more toward stability for braking and accelerating. His durable 120 TPI and Kevlar bead also mean that you'll be rolling fat with virtually no flats. The Surly Lou Fat Bike Tire comes in size 26 X 4. 8 and fits rims 65 100mm. It's meant to be paired with the front specific Surly Bud Fat Bike Tire.