LEGO part 56908c01 - Light Bluish Gray Wheel 43.2mm D. x 26mm Technic Racing Small, 6 Pin Holes with Black Tire 81.6 x 38 R Balloon (56908 / 45982) at BrickScout
LEGO Tires Grip Test - YouTube
Technic Parts for Lego Kits Tire Wheel Hub RC Car Building Blocks Model Sets DIY | eBay
Tire Technic Racing Large with 'MICHELIN' White Pattern : Part 32296pb02 | BrickLink