VSR PST Silicone Tuff ones Rear Tires S1 .370″. These are a great stock replacement tire for your T Jet Tuff Ones, AW Ultra G and other cars that utilize a .370 OD tire and .186″ rim. Instantly brings the car back up to speed. Best bang for your buck. S1 is our Soft compound while M1 is Medium. Listing is for 1 pair of tires.