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## Re: Fw: Going to look at a '71 B tomorrow

 To: "MG List" Re: Fw: Going to look at a '71 B tomorrow Max Heim Fri, 17 Dec 1999 14:41:18 -0800
 ```Simple. It doesn't. They have the same contact area, just different length & width dimensions. More width x less length = same area. Let me repeat: wider tires do not give you a bigger contact patch (unless you also lower the tire pressure). They just change its shape. It just happens that the shape makes a difference. See some of the Road & Track tire test articles for a thorough explanation. But I think you can see how the contact patch might have different characteristics along its long dimension (width on a wide tire, length on a skinny tire) than along its short dimension. The fact that the tire sidewalls tend to roll under lateral force has a more adverse effect on the skinny tire, for instance. And the buildup of a wave of water or snow in front of the leading edge of the tread has a greater effect on the wide tire, in that it is easier for the buildup to escape to the side of the skinny tire. wizardz had this to say: > >Again.... not quite. .....circumferences being the same... >if properly inflated, both a narrow and a wide tire, of the same size tire, >are going to have the same size lengthwise contact dimension. > >why else (how else) could widening a tire give more contact area. > > >Matt is right. Tire pressure and weight of car are the determining >factors of contact patch size. Wider tires just make it a different >shape; i.e. extended crosswise. But for the purpose of snow braking, it >may very well be that you want the patch extended lengthwise, as it would >with narrow tires. > -- Max Heim '66 MGB GHN3L76149 If you're near Mountain View, CA, it's the red one with the silver bootlid. ```
 Current Thread Re: Going to look at a '71 B tomorrow, (continued) Re: Going to look at a '71 B tomorrow, Ajhsys Re: Going to look at a '71 B tomorrow, Tab Julius Re: Going to look at a '71 B tomorrow, Tim Nagy RE: Going to look at a '71 B tomorrow, Dodd, Kelvin Re: Going to look at a '71 B tomorrow, Ajhsys Re: Going to look at a '71 B tomorrow, Tim Nagy Re: Going to look at a '71 B tomorrow, Max Heim Fw: Going to look at a '71 B tomorrow, wizardz Re: Fw: Going to look at a '71 B tomorrow, Tab Julius Re: Going to look at a '71 B tomorrow, Ajhsys Re: Fw: Going to look at a '71 B tomorrow, Max Heim <= Re: Going to look at a '71 B tomorrow, Paul Hunt Re: Fw: Going to look at a '71 B tomorrow, Ajhsys Re: Going to look at a '71 B tomorrow, Paul Hunt Re: Fw: Going to look at a '71 B tomorrow, Larry Macy Re: Fw: Going to look at a '71 B tomorrow, REwald9535 Re: Fw: Going to look at a '71 B tomorrow, Tab Julius Re: Fw: Going to look at a '71 B tomorrow, Larry Macy Re: Fw: Going to look at a '71 B tomorrow, Ajhsys Re: Fw: Going to look at a '71 B tomorrow, Ajhsys Re: Fw: Going to look at a '71 B tomorrow, Max Heim