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Maximum rim and tire width

15K views 49 replies 9 participants last post by  shabby  
I have a feeling it is more tire type and compound for drag racing that he is interested in. For drags you want a lot of sidewall flex on launch and a 15" wheel definitely gives you that. Wondering if the width question pertains to tire size availability in his particular tire choice.
 
Not necessarily. While putting more weight per inch (really psi...but not in reference to air pressure here) on the contact patch will up the traction available on that tire, it doesn't increase in a linear fashion as weight increases. A wider tire with softer rubber and less psi applied to it can generate more grip and be less prone to slipping than a narrow tire with harder rubber and a higher psi load. So if softer rubber tires are only available in wider sizes that may drive his choice.

Then there is the issue of lateral grip and how the tire resists that...

...and a whole lot of other physics stuff I'm not even going to pretend I understand.