Tire 81.6x36 R Technic Straight Tread, LEGO® Part# x1825. Alternate part# 56907. This tire goes with wheel parts #44772, #44772pb01, #15038, #15038pb01, #15038pb02, #49294, and #2998. Comes in the color black in various conditions. 

Appears in set# 42110 (Land Rover Defender), set# 42000 (Grand Prix Racer), and set# 8146 (Nitro Muscle). 

To learn more about the parts we offer, call us at our storefront at 470-414-2208 and we'll be happy to help to answer any questions you may have.