Monster Energy NASCAR Cup Series: Race No. 5 – Auto Club 400
NASCAR Xfinity Series: Race No. 5 – Xfinity 300
Auto Club Speedway (2.0-mile oval,) Fontana, Calif.
Tire management will be key at Auto Club Speedway: The worn surface at Auto Club Speedway puts a premium on grip, which is exacerbated further by the downforce reduction on the 2017 Cup aerodynamic package. The Goodyear tire combination we bring to Auto Club is unique to this track. It is designed to maximize grip while providing the stability and toughness needed for 200+ mph corner entry speeds. Particularly challenging are the demands placed on the left-side tires as teams challenge the 19 psi recommendation to try to maximize grip. This operating condition led to the development of a robust left-side tire design, with a compliant sidewall that has become the standard for intermediate speedways. With three seconds of fall-off over the course of a run and a two-set reduction in race sets from 2016, tire strategy will be a key element on Sunday.
Teams in both the Monster Energy NASCAR Cup and Xfinity Series will run the same tire set-up at Auto Club Speedway this week, this is the same combination of left- and right-side tires that Cup teams ran at this track last year. Xfinity teams ran this left-side tire at Auto Club in 2016, but this is their first time running this multi-zone tread right-side tire. In addition to Auto Club, Cup teams ran this left-side tire at Indianapolis and Darlington last season, while Xfinity teams ran it at Pocono and Indianapolis. This is the only track at which these teams run this right-side tire which has a multi-zone tread tire, features two distinct tread compounds on the same tire — one for endurance and heat resistance on the inboard two inches of the tread and one for traction on the outboard 10 inches. On all NASCAR ovals greater than one mile in length, teams are required to run liners in all four tire positions. At Auto Club air pressure in those inner liners should be 12-25 psi greater than that of the outer tire.