From Jayski.
NASCAR SPRINT CUP SERIES:
Set limits: 5 sets for practice/qualifying, and 5 sets 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
Notes: Teams in the NASCAR Sprint Cup Series will run the same Goodyear tire code (D-4678) on all four tire positions at Sonoma . . . this is the first time teams will be running this code . . . compared to what was run at Sonoma last year, this tire features a decrease in tread gage (thickness) . . . as on all NASCAR road courses, teams will not run inner liners in their tires at Sonoma.
Wet Weather Tires: Goodyear will bring its wet weather radials (D-4215) for use at Sonoma, should NASCAR decide that conditions warrant . . . teams are allowed up to three sets of "wets" for practice/qualifying and up to three sets for the race . . . this tire code was last run by NASCAR Xfinity Series teams at Road America in 2014.
NASCAR CAMPING WORLD TRUCK SERIES:
Tire: Goodyear Eagle Intermediate Radials
Set limits: 5 sets for the event
Tire Codes:
Left-side -- D-4674;
Right-side -- D-4676
Tire Circumference:
Left-side -- 87.20 in. (2,215 mm);
Right-side -- 88.27 in. (2,242 mm)
Minimum Recommended Inflation:
Left Front -- 15 psi; Right Front -- 31 psi;
Left Rear -- 13 psi; Right Rear -- 28 psi
Notes: This is a new tire set-up for NASCAR Camping World Truck Series teams at Gateway . . . this is the first time either of these two tire codes have been run . . . compared to what was run at Gateway last year, this set-up features a slight compound change and has been brought into line with what the Sprint Cup and Xfinity cars ran at Richmond in April . . . as on all NASCAR ovals greater than one mile in length, teams are required to run inner liners in all four tire positions at Gateway . . . air pressure in those inner liners should be 12-25 psi greater than that of the outer tire.
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