Both Cup and Gander Outdoors Truck Series will use tire setups that are new to Sonoma Raceway and World Wide Technology Raceway at Gateway respectively.
In Cup, teams will the same tire code on all four tires at Sonoma. This is the first time teams have run this tire code.
Compared to last year’s tire code at Sonoma, this tire features a minor construction update, similar to what has been incorporated at other tracks. This tire code is unique to this track for NASCAR’s three national touring series, which will run different tire codes at other road courses.
As on all NASCAR road courses, teams will not run inner liners in their tires at Sonoma.
Set limits: Three sets for practice, one set for qualifying and seven sets for the race (Six race sets plus one set transferred from qualifying or practice)
Tire Code: D-4882 (same on all four tire positions)
Tire Circumference: 88.58 in. (2,250 mm)
Minimum Recommended Inflation: Left Front – 22 psi; Right Front – 20 psi; Left Rear – 17 psi; Right Rear – 17 psi
Gander Outdoors Truck Series tire info
Truck Series teams will use the same tire setup that had last weekend at Iowa Speedway, but this will be the first time they’ve used it at Gateway.
Compared to what was run in 2018, this left-side tire features a construction update to align with what is run at other tracks, while this right-side tire features a compound change to give the trucks more grip. As on all NASCAR ovals greater than 1-mile in length, teams are required to run inner liners in all four tire positions at Gateway.
Air pressure in the inner liners should be 12-25 psi greater than that of the outer tire.
Set limits: Five sets for the event
Tire Codes: Left-side — D-4864; Right-side — D-4876
Tire Circumference: Left-side — 2,227 mm (87.68 in.); Right-side — 2,244 mm (88.35 in.)
Minimum Recommended Inflation: Left Front – 15 psi; Left Rear – 13 psi; Right Front – 31 psi; Right Rear – 28 psi