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

Subject: Re: Fw: Going to look at a '71 B tomorrow
Date: Sat, 18 Dec 1999 08:52:19 EST
In a message dated 12/17/1999 5:41:36 PM Eastern Standard Time, writes:

<< 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. >>

- - - - - - - - - - - - - - - - - - -

Keep in mind that what we are comparing is two tires that are EXACTLY the 
same.  The same rubber compound, the same sidewall height, the same sidewall 
stiffness, the same tread, AND the same tire pressure, all on the same car.  
In that case, the contact patch will be the same area, even with different 
width tires.

Back to the real world.  Wider tires are of no advantage if they have the 
same sidewall height and stiffness.  They aren't much stickier (for 
competition use, at least) if they don't have a softer rubber compound, etc.  
So in the real world, narrower, taller tires tend to have a smaller contact 
patch area than wider, lower tires (that you probably bought to make the car 
corner better in the dry), and so they are better in snow.  

Ok...back to LBCs.

Allen Hefner
Philly Region SCCA Rally Steward
'77 Midget
'92 Mitsubishi Expo LRV Sport

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