Knobby tread For go-karts & ATVs Superb control For hard or soft surfaces Tubeless pneumatic tire does not need an inner tube The 145/70-6 knobby is a tire made especially for the Baja Blitz, Dirt Bug, Doodle Bug, and Racer Mini Bikes But the knobby isn’t just for ATVs The 145/70-6 knobby is a tire made especially for the Baja Blitz, Dirt Bug, Doodle Bug, and Racer Mini Bikes. But the knobby isn’t just for ATVs. The AQ3015 knobby tread tire is also a perfect tire for utility vehicles, side by sides and fun karts. Tire size: 145/70-6 Tread code: AQ3015 Tread type: Knobby Tube-type/tubeless: Tubeless Max weight: 250 lbs. Bead-to-Bead: 2-3/8″ (2.375″) PSI: 4.0 Rim size: 6.0×4.5