News NASCAR using new left-side tire at Kentucky

22:07  11 july  2018
22:07  11 july  2018 Source:   nbcsports.com

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Martin Truex Jr. wins Quaker State 400 at Kentucky for his third victory this season in the Monster Energy NASCAR Cup Series. Again he charged through the field, and when the cars lined up for the final restart in overtime, Larson took advantage of four new tires to grab second place.

June tire test led Goodyear to change the tire combination it will use this weekend at Kentucky . All three series will use the same left - side tire . Sprint Cup Tire Info. Cassidy, who had been with NASCAR since 2000, was named to the new position January 30.

  NASCAR using new left-side tire at Kentucky © Getty Images

All three of NASCAR’s national series will be in action this week at Kentucky Speedway and each will be using the same tire setup.

That includes a new left-side tire. The tire has a construction update and a compound change to give the cars and trucks more grip.

The tire was confirmed by a test in May with Clint Bowyer, William Byron, Joey Logano, Ryan Newman and Martin Truex Jr.

Teams will have the same right-side tire they used last year at Kentucky.

Here’s the tire info for this weekend.

Set limits: Cup: Three sets for practice, one set for qualifying and seven sets for the race

Xfinity: Seven sets for the event

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  Goodyear tire info for Talladega Superspeedway Cup and Xfinity teams will have the same tire setups this weekend in Alabama.While the left-side tire is unchanged from what’s been in use at the track since October 2014, the right-side tire will have a minor construction update.

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NASCAR will reduce downforce and use a smaller spoiler starting at Kentucky Speedway. So what changed from when it seemed NASCAR would make no changes to trying a new package in just a few weeks? O'Donnell left the door open to using a similar package at other tracks this season

Truck: Six sets for the event

Tire Codes: Left-side — D-4798; Right-side — D-4750

Tire Circumference: Left-side — 2,224 mm (87.56 in.); Right-side — 2,250 mm (88.58 in.)

Minimum Recommended Inflation: Left Front – 22 psi; Left Rear – 22 psi; Right Front – 52 psi; Right Rear — 50 psi

Like on all NASCAR ovals greater than one mile in length, teams are required to run liners in all four tire positions at Kentucky. Air pressure in those inner liners should be 12-25 psi greater  than that of the outer tire.

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