Pneumatic tires are inflated with air just like bicycle or car tires. When a pneumatic wheel goes over a bump or curb the air compresses and acts as a shock absorber. The main advantage to this tire is a smoother more cushioned ride and familiar mane uverability. Pneumatic wheels are greatly affected by temperatures just like an automobile tire. They have a load capacity of 300 pounds. This pneumatic wheel is available in three options:10" wheel with 5/8" axle bore I.D. with 3.5" tread width and 2.25" hub length10" wheel with 3/4" axle bore I.D. with 3.5" tread width and with 2.25" hub length12" wheel with 3/4" axle bore I.D. with 4" tread width and with 3.25" hub lengthThis is the best wheel for handling curbs and uneven surfaces. Order you r replacement wheels today