Tire pressure of bigger tires?

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Sep 7, 2012 | 06:44 AM

#16

car5car

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Joined: Jan 2012

Posts: 415

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From: FL

Year: 2001

Model: Cherokee

Engine: 4.0

This formula seems logical (?)
Pbig/Pst=(Dst/Dbig) x (Wst/Wbig)
Pbig pressure of bigger tires
Pst pressure of standard tires
D diameter
W width

Sep 7, 2012 | 06:47 AM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by car5car

This formula seems logical (?)
Pbig/Pst=(Dst/Dbig) x (Wst/Wbig)
Pbig pressure of bigger tires
Pst pressure of standard tires
D diameter
W width

Not to me.

Sep 7, 2012 | 07:32 AM

#18

N20jeep

CF Veteran

Joined: Mar 2010

Posts: 6,685

Likes: 6

From: Jacksonville, FL

Year: 92

Model: Cherokee

Engine: 4.0

15psi on the street with my 35's

Sep 7, 2012 | 07:59 AM

#19

car5car

Thread Starter

Banned

Joined: Jan 2012

Posts: 415

Likes: 1

From: FL

Year: 2001

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Not to me.

If tire is 10% wider and diameter is 10% bigger, pressure should be dropped 1.1 x 1.1 = 1.21
21%
???

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