Both Cup and Xfinity Series will race on new tire compounds on all four tires this weekend at Michigan International Speedway.
The compounds on both the left and right-side tires are a result of an April tire test at the 2-mile track. The test involved Aric Almirola, Alex Bowman, Austin Dillon, Brad Keselowski and Martin Truex Jr.
Compared to what was run at Michigan last year, this left-side tire features an updated construction that brings it into line with what is run at other speedways and a new compound to introduce more wear, while this right-side is a single tread compound tire (last year was a multi-zone tread tire) with a new compound that will introduce more wear and run cooler.
Keselowski voiced his disappointment in the choice of tire.
Where do I ask to be taken off a press release?
— Brad Keselowski (@keselowski) June 6, 2018
Our team (and several others) tested multiple tire compounds and recommended every one of them but this one. In no way do I wanna be associated with this decision. https://t.co/tlzP4slxrs
Here’s the tire info for Cup and Xfinity.
Set limits: Cup: Three sets for practice, one set for qualifying and seven sets for the race; Xfinity: Six sets for the event
Tire Codes: Left-side -- D-4770; Right-side -- D-4796
Tire Circumference: Left-side -- 2,227 mm (87.68 in.); Right-side -- 2,251 mm (88.62 in.)
Minimum Recommended Inflation: Left Front - 22 psi; Left Rear – 22 psi; Right Front - 54 psi; Right Rear - 50 psi
Camping World Truck Series -Texas Motor Speedway
This is the first time Truck Series teams will run this left-side tire code at Texas, though they did run this same right-side code twice at the track last season. Compared to what Truck teams ran at Texas last season, this left-side tire features a construction update to align with what is run at other speedways.
Set limits: Six sets for the event
Tire Codes: Left-side -- D-4782; Right-side -- D-4718
Tire Circumference: Left-side -- 87.68 in. (2,227 mm); Right-side -- 88.62 in. (2,251 mm)
Minimum Recommended Inflation: Left Front -- 24 psi; Left Rear -- 22 psi; Right Front -- 52 psi; Right Rear -- 50 psi