Benefit to a wider wheel?

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FastBuick
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Benefit to a wider wheel?

Postby FastBuick » Mon Oct 10, 2016 11:09 am

Is there a benefit to running a 15" wide wheel with a 14" wide treadwidth and 16.2" section width tire? And if so what are they?
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Re: Benefit to a wider wheel?

Postby Greenlight » Tue Oct 11, 2016 10:53 pm

1) The contact patch tends to be larger and remains larger for a longer period as you go down the track. Imagine if you had a two inch wide rim. The outer portion of the tire would tend to curl up and make the contact patch narrower as the wheel RPM increases.

2) The tire growth will be reduced, which will act like more gear (higher RPM) at the finish line. Again, imagine you had a two inch wide rim. As the wheel RPM increases, the narrow rimmed wheel will result in a much higher tire circumference at the finish line. This effect is exaggerated with a light car (dragster).
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Re: Benefit to a wider wheel?

Postby FastBuick » Wed Oct 12, 2016 6:39 am

Greenlight wrote:1) The contact patch tends to be larger and remains larger for a longer period as you go down the track. Imagine if you had a two inch wide rim. The outer portion of the tire would tend to curl up and make the contact patch narrower as the wheel RPM increases.

2) The tire growth will be reduced, which will act like more gear (higher RPM) at the finish line. Again, imagine you had a two inch wide rim. As the wheel RPM increases, the narrow rimmed wheel will result in a much higher tire circumference at the finish line. This effect is exaggerated with a light car (dragster).


Makes sense. So do you think there is a way to figure out how much growth you will lose? Do you think if you go from a 14" to a 15" wide rim you lose 1" of tire growth?
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Re: Benefit to a wider wheel?

Postby Greenlight » Thu Oct 13, 2016 9:49 pm

The change in tire growth will depend on the vehicle weight and tire speed.
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