Lovely 19++ Pit Bike Tires. Read our buyer's guide and see our top picks for racing questions like, which bike tires are the best, or what size should i get? We have pit bikes with 12 & 14 front wheels and 10 & 12 rear wheels. A wide variety of pit bike. Pit bull fang sport tires. Pit Bike Tires - Rear Back 90 100 14 Tire Tube 14 For Dirt Pit Bike Ssr Crf70 Ttr100 Klx65 Ebay Fat tires and plus tires: 700 x 32c indicates a tire that has an outer diameter of 700mm and a width of 32mm.