Monster Energy NASCAR Cup Series, Race No. 15 – FireKeepers Casino 400
NASCAR Xfinity Series, Race No. 13 – Irish Hills 250
Multi-Zone Tread Tire Enables Goodyear to
Give Cars Maximum Grip on High Speed Tracks:
Goodyear’s multi-zone tread right-side tire, like the one run at
Michigan International Speedway this week, is designed and built with two goals
(1) Use one compound to protect the inboard portion of the tread that
sees the most heat and takes the most abuse in the high-camber world of NASCAR
(2) Use a second compound on the outboard portion of the tire to
give the cars more grip in the corners
This has become increasingly important as NASCAR goes to lower downforce aerodynamic
packages in both the Cup and XfinitySeries.
When Goodyear introduced the multi-zone tire at Atlanta Motor Speedway
back in 2013, the inboard “Endurance Zone” was four inches wide, while the outboard
“Traction Zone” took up the remaining eight inches of tread width. In 2017, as it has
been over the past several seasons, Goodyear has refined the manufacturing process
to expand the “softer” part of the tire out to 10 inches wide, giving the cars even more
grip and enhancing the racing.
Teams in both the NASCAR Cup and Xfinity Series will run the same tire set-up
at Michigan this week. At Michigan for the Cup, cars will be running the same left-side
tire code (D-4702) like last year, the right-side tire code (D-4726) is a multi-zone tread tire,
which features two different tread compounds on the same tire, the compound on the outboard
10 inches of the tread has been changed to introduce more wear.
In Xfinity, compared to what was run at Michigan in 2016, this left-side features
a compound change for more grip, while the change on the right-side is the same as in Cup,
teams in both of these series ran this right-side tire code at Las Vegas earlier this season.
As on all NASCAR ovals greater than one mile in length, teams are required to run inner
liners in all four tire positions. At Michigan the air pressure in those inner liners should be
12-25 psi greater than that of the outer tire.