Pro-Line Proton 2.2" 1/10 Off-Road Buggy Rear Tires (Manufacturer Part Number: 8226). [1, 2]

These are high-performance racing tyres designed specifically for the rear wheels of 1/10 scale remote-controlled (RC) off-road buggies. Depending on your racing surface, they are available in a few different rubber compounds: 

M4 (Super Soft Compound): Part number 8226-03, perfect for cold weather or low-grip dirt environments.