Top speed?
Joined: Mar 2006
Posts: 8,997
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From: Buffalo, NY
Ok, I'll be the noob and post the question.
What exactly is tire flex/deformation? I'm assuming it is something that happens at higher speeds due to the tire spinning faster, but could someone explain it to me?
What exactly is tire flex/deformation? I'm assuming it is something that happens at higher speeds due to the tire spinning faster, but could someone explain it to me?
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Joined: Dec 2005
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From: Connecticut
a tire deforms when its spinning very rapidly.. basically the diameter increases and the contact patch decreases. it is a function of the longitudinal tire stiffness and longitudinal force. it can be calculated with some simple calculus, but requires a lot of measurements
Joined: Mar 2006
Posts: 8,997
Likes: 80
From: Buffalo, NY
I've seen that before with the top fuel drag cars, basically it looks like the tire goes from an o to an 0 (well, I'm limited by the characters on a keyboard, but you get the idea)
If the tire diameter increases, the amount of rubber making contact with the road decreases...my question is to how this would affect top speed? Is it due to the fact that there is now less traction? Or is it because you now have a larger diameter tire which in turn is spinning the wheel faster causing a higher reading on the speedometer?
Also, is the magnitude of deformation affected at all by the speed rating on a tire either?
Sorry for all the questions, just trying to learn more here!
If the tire diameter increases, the amount of rubber making contact with the road decreases...my question is to how this would affect top speed? Is it due to the fact that there is now less traction? Or is it because you now have a larger diameter tire which in turn is spinning the wheel faster causing a higher reading on the speedometer?
Also, is the magnitude of deformation affected at all by the speed rating on a tire either?
Sorry for all the questions, just trying to learn more here!
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Joined: May 2006
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From: Germantown
Originally Posted by Crazy_Schizo,May 16 2006, 10:11 AM
I've seen that before with the top fuel drag cars, basically it looks like the tire goes from an o to an 0 (well, I'm limited by the characters on a keyboard, but you get the idea)
If the tire diameter increases, the amount of rubber making contact with the road decreases...my question is to how this would affect top speed? Is it due to the fact that there is now less traction? Or is it because you now have a larger diameter tire which in turn is spinning the wheel faster causing a higher reading on the speedometer?
Also, is the magnitude of deformation affected at all by the speed rating on a tire either?
Sorry for all the questions, just trying to learn more here!
If the tire diameter increases, the amount of rubber making contact with the road decreases...my question is to how this would affect top speed? Is it due to the fact that there is now less traction? Or is it because you now have a larger diameter tire which in turn is spinning the wheel faster causing a higher reading on the speedometer?
Also, is the magnitude of deformation affected at all by the speed rating on a tire either?
Sorry for all the questions, just trying to learn more here!
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Joined: Feb 2005
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Correct, less width, larger total diameter, therefore taller gearing and a higher top speed. It seems these guys are well aware of this and already incorporated it into their estimates. Most lower profile tires do not have a huge degree of tire deformation anyhow. It's wide tires with tall sidewalls that 'suffer' most from it.
As far as traction/friction go, there is technically the same amount of contact patches hitting the concrete, though I guess theoretically they would be condensed. I don't think it would be significant enough to cause problems on lower profile tires.
As far as traction/friction go, there is technically the same amount of contact patches hitting the concrete, though I guess theoretically they would be condensed. I don't think it would be significant enough to cause problems on lower profile tires.
Thread Starter
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Originally Posted by sahtt,May 16 2006, 10:26 AM
Correct, less width, larger total diameter, therefore taller gearing and a higher top speed. It seems these guys are well aware of this and already incorporated it into their estimates. Most lower profile tires do not have a huge degree of tire deformation anyhow. It's wide tires with tall sidewalls that 'suffer' most from it.
As far as traction/friction go, there is technically the same amount of contact patches hitting the concrete, though I guess theoretically they would be condensed. I don't think it would be significant enough to cause problems on lower profile tires.
As far as traction/friction go, there is technically the same amount of contact patches hitting the concrete, though I guess theoretically they would be condensed. I don't think it would be significant enough to cause problems on lower profile tires.