Monster Energy NASCAR Cup Series: Race No. 18 – Quaker State 400
NASCAR Xfinity Series: Race No. 16 – Alsco 300
NASCAR Camping World Truck Series: Race No. 10 – Buckle Up Your Truck 225
Tire Test Yields Answers to New Surface Questions: For the second year in a row, NASCAR returns to Kentucky Speedway with a brand new track surface. After reconfiguring and repaving before the 2016 races, the speedway laid down another four-inch layer of asphalt on top for 2017. Because of that, Goodyear held a tire test at the Sparta, Ky.-based speedway in May.
The goal of that test was both to tune the grip to the fresh surface as the Cup and Xfinity Series go to lower downforce packages and induce more wear on a new surface that won’t easily wear tires and take on rubber. The reason why the latter is important is two-fold – (1) when tires wear it often puts a premium on tire management and maintaining the car’s balance over the course of a full fuel run, and (2) when a track takes rubber, it creates multiple racing grooves and creates conditions for better racing.
Teams in all three NASCAR national series in action at Kentucky this week will run the same tire set-up with teams running the same left-side tire code (D-4688) as last year at Kentucky, but with a new right-side code (D-4750). Compared to what was run last season, this right-side tire features a compound change to give more grip and introduce more wear.
This tire set-up came out of a Goodyear test at Kentucky on May 9-10, with drivers Kurt Busch, Austin Dillon, Erik Jones and Jamie McMurray.
On all NASCAR ovals greater than one mile in length, teams are required to run liners in all four tire positions at Kentucky with air pressure in those inner liners 12-25 psi greater than that of the outer tire.