These new tires are RACE PROVEN to provide great grip on carpet and asphalt. The tires have many months of testing and provide excellent grip and handling on both low-traction asphalt and high grip carpet. Under normal conditions, the tires show very little wear and no lap time degradation. The first run on these tires is no faster than the 30th run. The tires respond very well to all the popular additives. Dual scale looks - the tires can be mounted in both NASCAR/F1 style with a larger sidewall or GT style with low profile sidewalls. The tires come with inserts and measure 2.45" in diameter. Fit CRC GTR rims and Tamiya foam rims.