This is a pair of Traxxas Rustler Ribbed Front Tires Pre-Mounted on 2.8" Black Chrome All-Star Wheels. These have a 12mm hex and are designed for the front of the Rustler XL-5 and Rustler VXL trucks.
2.8" All Star black chrome wheels
Two 2.8" mounted nitro rear/electric front tires, All Star chrome wheels and foam inserts
Outside diameter: 4.13" (105mm)
Inside diameter: 2.8" (71mm)
Width: 2.04" (52mm)
Hex Size: 12mm