Post by
Nathan »
https://forums.nicoclub.com/nathan-u5605.html
Sat May 01, 2004 7:19 am
I strongly suggest everyone read this thread, Contact Patch:http://www.nissaninfiniticlub....61953
An important excerpt: Q45tech states that ""One of the most common swaps is to change the standard tyres for ones with a lower profile and wider section. However, a tyre swap like this will change the shape of the contact patch of the tyre on the road. Changing to the wider tyre will give a contact patch that is shorter fore/aft, but is wider. The change in width is easy to understand - a 225 tyre is nominally 20mm wider than a 205 so of course the contact patch is wider - but what about the contact patch shortening in the fore/aft direction? This occurs because - despite widespread belief to the contrary - only the internal air pressure and the weight of the car acting through the wheel determine a tyre's contact patch area. Nothing else affects contact patch area- not tyre construction, nor tyre size! As a result, if the contact patch is wider, the patch must also be shorter, so that the same area is maintained."