A tire with a block profile especially suited for classic military bikes and Urals, the K37 combines a classic off-road look with modern technology and rubber. The 4.00-19 has a square contour developed for use on heavy motorcycles and carts.
MS = All-Season Tires with Mud and Snow Designation
If a tire has MS, M+S, M/S or M&S on it, then it meets the Rubber Manufacturers Association (RMA) guidelines for a mud and snow tire.
TT = Tube Type Tire