01CuHed
TJ Enthusiast
The tire and loading information placard on my 2001 Wrangler Sport/4.0L that came original with 215/75R15 tires states 33lb per tire TJim. The information you got from other posters above is probably more accurate!
I once got hold of the official european formula to calculate pressure for a certain load.
People who calculate lineair, dont do it bad.
But is also speedrelated, for liwer speed lower pressure is still safe.
And on track , and in mud/sand, you can even go much lower.
For on road, the goal is not to overheat any part of tire.
Lower speed, lesser cycles a second, so deflection of tire is allowed more, so more heatproduction a cycle. Then still same heatproduction a second.
So give weight and speed and terain, and tire- specifications, and I will calculate, and show how.
does anyone have the Tire and Loading Information Placard for a Wrangler TJ 2004 2.4 that came with 215/75r15 ?
or at least how I can find it if there is not in my vehicle.
I am sorry, my bad!Googled the sise and found XL 106T
This is maxload 2094lbs AT 42 or 44 psi, wich is standard for XL / reinforced/Extraload, upto 99mph.
The 51 psi is the maximum allowed cold pressure, and difference with the 44psi referencepressure, as it is called, and maxcold of 51psi, is used to highen up the referencepressure, for higher speed , but also for camberangle above 2 degr( no issue for Yeeps).
But your given 2000lbs total weight, seems low to me. This weigt can be carried by one tire. Can you also give Gross vehicle weight rating and gross axleweight rating( GVWR, GAWR) .
Back of the sigarbox methode is.
First add 10% reserve to weight on one tire.
Substract first 100lbs from weight +10% on tire and maxload of tire.
Yours 2090 lbs -100 lbs= 1990lbs.
Say weight on tire +10%=1095-100 = 995 lbs . Devide 995/1990= 0,5 ( coincidence no) x referencepressure of 44psi= 22 psi.
This then is for on road upto 99mph.
I determined that for 99mph and 10% reserve gives highest pressure, so with max reserve, and still acceptable comfort and gripp and reasonable fuelconsumption.
Equally devided this would mean axleweigt of 1810 lbs, more realistic weight to my opinion, but correct me if wrong.
Give the additional info ,and I calc it for you.
GAWR Front/Rear (lbs) |
2200/2650 |
Filled in in my made motorhome, pressure calculator, wich I even can use for airplanes, gave for 2200lbs axleload front and back 24 psi all around. If bacj really fully loaded to 2650 lbs, it would need 30 psi.I am sorry, my bad!
The GVW is 4409.25 pounds (it is 2000kg), the GAWR I am not sure but it must be :
GAWR Front/Rear (lbs)
2200/2650