Re: [ST] 190 on rear

[Colt4530 <colt4530@xxxxxxxxxxx>]

Actually, the answer to both is, "yes, that's correct."

A top Fuel dragster runs 6 to maybe 15 psi in the rear and probably 75 
psi in the front.  The weight distribution is no where near 50/50, so it 
works.  One reason a T.F. dragster is so long is to move the weight off 
of the front tires.  The small high pressure tires have very low rolling 
resistance.  If the bicycle tire and the monster truck tire were 
inflated to 30 psi each and loaded with the same weight, the contact 
patch would be identical, barring something unusual in the construction 
of the truck tire.

The loaded with the same weight seems to be the hang up.  Remember, 
pounds divided by psi = inches.

John
'02 RS
Chattanooga

  Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx> wrote
So your saying that if you inflated the front and
 > rear tires on a top
 > fuel dragster with an equal pressure, and had an
 > even 50/50 weight
 > distribution front and rear, that the two tires
 > would have an equal
 > contact patch?


Brad Turner wrote:
> John,
> 
> This sounds too simplistic to be true. If you assertion is applied to an
> extreme example that would suggest that for a bicycle tire and a monster
> truck tire both inflated to 30psi the contact patch would be the same.
> Intuitively this seems wrong. I'm sure I'm missing the point you were
> making, can you clarify it again. Thanks.
> 
> later,
> -brad-
> 
> -----Original Message-----
> From: colt4530@xxxxxxxxxxx [mailto:colt4530@xxxxxxxxxxx]
> Sent: Tuesday, December 17, 2002 11:46 AM
> To: ST@xxxxxxxxxxxxxx
> Subject: RE: [ST] 190 on rear
> 
> 
> 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. 
> That notwithstanding, a 190/50 may have desireable qualities over a 180/55,
> but the contact patch  won't be one of them.
> 
> John
> '02 RS
> Chattanooga


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