Re: [ST] 190 on rear

[Colt4530 <colt4530@xxxxxxxxxxx>]

You are completely correct, Neil.  Corvette run-flat tires would barely 
  be effected by pressure changes and rail car wheels are the example in 
the extreme.

Note this from charles: There is no perceptible/measureable differences 
in contact patch size between a 160, 170, 180 or 190 (assuming you are 
running at standard/recommended pressures (this from a Dunlop Tire rep).

John
'02 RS
Chattanooga

Anderson, Neil G (CPR) wrote:
> colt4530@xxxxxxxxxxx wrote:
> 
> 
>>Tires are bouyant devices.  So, at the same pressure and load, the contact
>>patch will be the same for any 2 tires.  It's like a boat; 500 pounds
>>displaces 500 pounds of water, whether in a bass boat or a coal barge. 
> 
> 
> Only if the wall stiffness and original shape is ignored.  If the two tyres
> are made of birthday balloon materials, the contact patches might be the
> same.  If they are made of something extremely stiff, say thin steel not
> rubber, that won't be true.
> 
> Neil
> 
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