Set limits: Cup: 3 sets for practice, 1 set for qualifying and 9 sets for the race (8 race sets plus 1 set transferred from qualifying or practice); Truck: 5 sets for the event
Tire Codes: Left-side — D-4588; Right-side — D-4722
Tire Circumference: Left-side — 2,221 mm (87.44 in.); Right-side — 2,251 mm (88.62 in.)
Minimum Recommended Inflation: Left Front — 10 psi; Left Rear — 10 psi; Right Front — 23 psi; Right Rear — 22 psi
Storyline – Laying rubber key to Martinsville: Relating to the tires, Martinsville’s concrete corners behave differently than its asphalt straightaways with the density of the surface making it more challenging for rubber to continuously adhere to the track. Because both of the track’s races are usually run in cool temperatures, Goodyear brought a new right-side tread compound to help rubber in the track in 2017. That move led to multiple racing grooves and created more side-by-side racing. Goodyear’s set-up also features constructions that work well to optimize the acceleration, deceleration and cornering required for Martinsville’s combination of long straightaways and tight, flat turns.
“We never quite know what type of weather we’re going to get when we go to Martinsville. Recently we’ve had a lot of cold and even snow, though this week it looks like the temperatures may be in the 60s all weekend,” said Greg Stucker, Goodyear’s director of racing. “What we had to do, because it is more difficult to lay rubber on the concrete track surface in colder temps, is come up with a compound formulation that accomplishes that in all weather conditions. We made a change to the right-side tread compound we bring to Martinsville back in 2017, and that produced good results right away. Laying rubber on the bottom, or preferred, groove in the corners makes teams move up the track to look for grip and have a lane to pass. That side=by-side action creates great racing on such a tight track.”
Notes – Goodyear returns to Martinsville on successful tire set-up: Teams in both the Monster Energy NASCAR Cup and NASCAR Gander Outdoors Truck Series will run the same tire set-up at Martinsville this weekend . . . this is the same tire set-up these teams have run at this track for the last four NASCAR race weekends . . . this left-side tire code has been run at Martinsville since April ’13, while this right-side tire code debuted in April ’17 . . . this is the only track at which NASCAR teams will run either of these two tire codes . . . as on most NASCAR ovals one mile or less in length, teams will not run inner liners in their tires at Martinsville.