Go Back   AudiWorld Forums > Audi Models > Audi A6 / S6 / RS 6 > A6 (C7 Platform) Discussion
Sign in using an external account
Register Forgot Password?

Notices

A6 (C7 Platform) Discussion Discussion forum for the C7 Audi A6 produced from 2011

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 11-04-2013, 02:41 PM   #1
James517
Audiworld Junior Member
Account #: 245076
 
James517's Avatar
 
Join Date: Oct 2012
Posts: 65
Default Tire patch - same size for most tire widths

I was at a Porsche club event a few weeks ago. During the ground school portion, they talked about the size of the contact patch a tire has on the road.

To my surprise, they made the point that changing tire sizes and widths tend to change the shape of the patch more than the size (square inches). The car's weight and tire pressure largely determine the size of the contact patch.

A narrower rim produces a more longitudinal patch (lengthwise, with the car), making it better for snow tires because there is a narrower surface rolling forward over the snow.

A wider rim produces a more transverse patch (across the car), making it better for dry, performance driving.

Hm-m-m. I had always assumed that wider tires gave you more contact with the road, but apparently not.
__________________

2012 3.0T A6 Quartz Gray Premium Plus
1999 A6
1973 Audi Fox (80)
rf5b.com
James517 is offline   Reply With Quote
Old 11-04-2013, 03:48 PM   #2
DeerHunter
AudiWorld Senior Member
Account #: 246555
 
DeerHunter's Avatar
 
Join Date: Nov 2012
Location: Edmonton, AB
Posts: 831
Default

Quote:
Originally Posted by James517 View Post
I was at a Porsche club event a few weeks ago. During the ground school portion, they talked about the size of the contact patch a tire has on the road.

To my surprise, they made the point that changing tire sizes and widths tend to change the shape of the patch more than the size (square inches). The car's weight and tire pressure largely determine the size of the contact patch.

A narrower rim produces a more longitudinal patch (lengthwise, with the car), making it better for snow tires because there is a narrower surface rolling forward over the snow.

A wider rim produces a more transverse patch (across the car), making it better for dry, performance driving.

Hm-m-m. I had always assumed that wider tires gave you more contact with the road, but apparently not.
This is something that I point out to a lot of people that have to have the widest tires possible, you know, for performance. The fact is, the amount of rubber on the road is pretty much determined by the two factors you mention - weight and tire pressure. Yes, there are some variances due to tire construction and rim width, but it's negligible.

It's true that a wider tire (which gives a short and wide contact patch), on a properly-sized rim, will give you more stability while cornering, but that's another discussion altogether. Conversely, wider tires do nothing for straight-line traction (and may hurt it). Much better to change the compound for better stick.
__________________
2013 Glacier White S6
2005 S4 Cabriolet
DeerHunter is offline   Reply With Quote
Old 11-04-2013, 03:48 PM
AudiWorld
Audi R8




Paid Advertisement
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -8. The time now is 09:26 AM.


Copyright 2014 AudiWorld.com Audi Enthusiast Community

Personal Contacts