8 1/2*2(50/75-6.1)' tire size is suitable for M365, 1S, 3, Essential, Pro, Pro 2 models and other scooters with 8.5 inch tire. Can be used as off-road tires. Tire tread provides good grip and friction. Package includes valve and you do not need to install any inner tube. Tubeless self-repairing tyres, ideal for minor punctures.