The Sprint Cup Series will be using a new tire code this weekend for the Toyota/Save Mart 350 at Sonoma Raceway. The code will be used on all four tires.
Compared to the tires used at Sonoma last year, this tire features a decrease in tread gauge (thickness). With all NASCAR road courses, teams will not run inner liners in their tires at Sonoma.
Team will be given five sets of tires for practice/qualifying and five for the race.
Tire Code: D-4678 (same on all four tire positions)
Tire Circumference: 88.66 in. (2,252 mm)
Minimum Recommended Inflation: Left Front — 22 psi; Right Front — 20 psi; Left Rear — 17 psi; Right Rear — 17 psi
Goodyear will have its wet weather radials (D-4215) present at the track in case NASCAR determines it necessary to use them. The rain tires have not been used since the Xfinity Series ran them at Road America in 2014.
Teams are allowed up to three sets of “wets” for practice/qualifying and up to three sets for the race.