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...the Gross Vechicle Weight Rating (GVWR) on the door sticker of my '09 Vibe is 3860 lbs, so I did a little 'number crunching' to see how close the other numbers related to that value:
1) door sticker tire pressure = 32 psi, front and rear
2) tire sidewall "maximum" air pressure = 44 psi
3) tire 'load index' value = 89, which equates to 1279 lbs at "rated" air pressure
4) so: (32psi / 44 psi)*(1279lbs / tire)*(4 tires) = 3720 lbs
5) that's 96% of GVWR, ie: (3720lbs / 3860 lbs) = 0.96
6) looks "close enuf" for decent approximation!
Last edited by gone-ot; 05-06-2010 at 03:47 PM..
Reason: in #3 corrected "maximum" to "rated"
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