These off-road tires were designed for small-diameter wheels, a trend in the 1980s. This set of two tires is compatible with 1.6-1.7-inch wheels. They feature a soft compound. A dedicated sponge inner is included. They are ideal for the rear tires of the Yokomo 834B Dogfighter and Associated RC10 series. Because the tire is soft, it can be mounted on wheels with slightly different diameters. Use instant glue to attach the wheels. The 1985 California Series is available in two types: "Type A," which provides more forward thrust, and "Type B," which emphasizes lateral grip. For the Wonder Dogfighter, we recommend using Type A for the front and Type B for the rear.