200x50 pneumatic inner tube. Need smaller quantities? Try https://www.ebay.com/itm/133337888780.

6" x 1.25" Pneumatic Wheel with 8mm bearings installed. Lightweight, only 9.1 ounces, good quality, durable, difficult to find.
Need but a few? Visit https://www.ebay.com/itm/132403651534.

200x50mm - strong, lightweight (less than 21 ozs. with bearings), 8" pneumatic tire w/5 spoke rim and 10mm I.D. bearings. Fits 15.5" mountainboard axles offered on our trucks page.
Need only a few? Visit https://www.ebay.com/itm/131983867879.

200x50mm - strong, lightweight (less than 21 ozs. with bearings), 8" pneumatic tire w/5 spoke rim and 12mm I.D. bearings. Fits 15" and 17" mountainboard axles offered on our trucks page. Need smaller quantities? Try https://www.ebay.com/itm/133604203694.

230mm x 65mm - 8-3/4" pneumatic tire w/lightweight polycarbonate hub and 12mm* I.D. bearings. 50mm through the center. Fits perfectly on our 15 inch Mountainboard truck with 12mm axle.