2021 Tire/Wheel Question

19USMC69

Crew Chief
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May 3, 2017
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Are the new tires the same diameter as the old?

Assuming they are (or close), the aspect ratio will obviously be different (numerically lower). In the world of street tires, a “skinnier” tire will result in better traction due to less sidewall flex. And more traction equals more friction which means more wear. If all this is correct, will we see more wear/pit stops next year?

Not a question: Last I read NASCAR believes 4-tire changes will take just a bit longer with the new hub. Interesting.
 

Formerjackman

Team Owner
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I believe the new wheel is 18" and yes the sidewall will be quite a bit shorter. I have been curious how much this will effect the team's ability to use air pressure for chassis adjustments. I would theorize that with less sidewall flex, the new tire would be less likely to influence the effective spring rate of the car.
 

Charlie Spencer

Road courses and short tracks.
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@19USMC69 , just for clarification, the 2021 wheel and tire will be the same dimensions as were used this year. The new wheel and tire (and car) have been delayed to 2022.

And I hope you have a good Veterans' Day.
 
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