The June 3-4 Goodyear tire test at Iowa Speedway provided valuable data from all three of NASCAR Cup Series’ OE manufacturers: Kyle Busch (Chevrolet), Austin Cindric (Ford) and Chase Briscoe (Toyota). As such, Goodyear will bring new left and right side tires for the 0.875-mile lap.
“Iowa presents a unique challenge with the speeds and sustained loads, as well as the two different ages of asphalt on the surface,” said Rick Heinrich, Goodyear NASCAR product manager. “The new race recommendation of Goodyear Racing Eagle tires for the Cup Series is ready for that challenge, as shown during the June test.”
A new right side tire for the NASCAR Xfinity Series will also be used this weekend. It was tested by Christian Eckes (Chevrolet) and Dean Thompson (Toyota) also at the June test. Xfinity Series teams will race the same left side tire as in the last two rounds at Dover and Indianapolis.
Fast Facts
NASCAR Cup Series
Race: Iowa Corn 350 Powered by Ethanol (350 laps / 306.25 miles)
Track: Iowa Speedway (0.875-mile oval)
Date/Time: Sunday, August 3, 3:30 p.m. ET
TV/Radio: USA, MRN, SiriusXM NASCAR Radio
Tire: Goodyear Racing Eagle
Tire Code: D-5244 left side, D-5266 right side
Previous Usage in 2025: first use (both sides)
Tire Circumference: 2,263 mm (89.1 in.) left side, 2,277 (89.6 in.) right side
Recommended Minimum Inflation: LF – 14 psi, RF – 30 psi, LR – 14 psi, RR – 28 psi
Total Dry Weather Sets: 11 (9 new race / 1 qualifying transfer to race / 1 practice)
Total Wet Weather Sets: 4
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NASCAR Xfinity Series
Race: HyVee Perks 250 (250 laps / 218.75 miles)
Track: Iowa Speedway (0.875-mile oval)
Date/Time: Saturday, August 2, 4:30 p.m. ET
TV/Radio: CW, MRN, SiriusXM NASCAR Radio
Tire: Goodyear Racing Eagle
Tire Code: D-6106 left side, D-6134 right side
Previous Usage in 2025: Homestead-Miami, Darlington, Bristol, Rockingham, Pocono, Dover, Indianapolis (left side), first use (right side)
Tire Circumference: 2,225 mm (87.6 in.) left side, 2,250 (88.6 in.) right side
Recommended Minimum Inflation: LF – 16 psi, RF – 36 psi, LR – 16 psi, RR – 34 psi
Total Dry Weather Sets: 6 (4 new race / 1 qualifying transfer to start race / 1 practice)
Total Wet Weather Sets: 3
— PitBox 91 —