Kaden
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Hi guys I need some help in deciding if I should buy a set of 225/75/16 cooper STs E load rated tires. Would having E rated tires effect my mpg or anything else??? They would be going on a 2003 Jeep Liberty Limited. Thanks
HELP!!! E load rated tires
- Thread starter Kaden
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An E rated tire is a 10 ply tire. It is heaver than a P rated 6 ply tire. So yes it will have a negative effect on your fuel mileage.
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Also. It will have a harsher ride with the stiffer side walls.
But a 10 ply will give better side wall protection when off roading.
If you go 10 ply. You need to do a chalk test or call the manufacturer for a recommendation for tier pressure. Being it is 10 ply and stiffer. You won't need the P rated psi. When I had a set of 10 ply I ran them at 28 psi front and 25 in the back. This gave me a good tire foot print when I did the chalk test. When I had them set at the recommended P rated 33 psi. The edges of the 10ply tread didn't come into contact with the surface during the chalk test.
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you can look up tire inflasion charts on the internet. Your never going to find one for cooper, but load range E, than pick same size Here
the first problem I see is the lowest pressure on this site for that size tire is 35 psi it will carry 1500 lbs (per tire). your jeep might way 4000 lbs spread between 4 tires?
I have never seen a chart go lower than 35psi, but in my 2006 single rear wheel 3500 ram pickup, when empty, I would run the tires down around 25-30 psi empty and never had a problem.
the first problem I see is the lowest pressure on this site for that size tire is 35 psi it will carry 1500 lbs (per tire). your jeep might way 4000 lbs spread between 4 tires?
I have never seen a chart go lower than 35psi, but in my 2006 single rear wheel 3500 ram pickup, when empty, I would run the tires down around 25-30 psi empty and never had a problem.
tjkj2002
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For load range D and E tires on a KJ,unless heavily modded(IE 500+lbs added weight) 35-40 psi is good.
believe it or not you will need more psi for the LT tire.
believe it or not you will need more psi for the LT tire.
Kaden
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So your saying if I don’t add 500 plus pounds run them at 35 to 40 psi?
Kaden
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I did some math and I would have to run them around 45 psi to match the load index of the stock tires at 33 psi.
I have the Cooper STT Pro tyres. I have written a thread in the past for that matter.
http://www.jeepkj.com/forum/f200/tire-pressure-calculation-62606/
http://www.jeepkj.com/forum/f200/tire-pressure-calculation-62606/
45 too much
Like tjkj mentioned 35-40 thats it 45 would be if you have a ton truck etc
not on a KJ , would be a way harsh ride
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yes
Kaden
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Ok thanks everyone
So now I'll ask, why a 10 ply ??
Just curious
Just curious
This. I had read a number of other 4x4/Jeep/Offorading articles that state that realistically, no Jeep needs E rated tires.. C at most.
tjkj2002
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Depends on were you wheel it(if you wheel it) as a "D" or "E" rated tire will be better suited for areas that have alot of rocks.
You can't safely air down P metric tires like you can LT tires either.I normally go down between 8-10psi on my KJ with LT tires,couldn't safely go much lower then 20psi on P metric tires.
Personally I would not put anything but a LT tire on a Jeep or a pickup.
No an LT tire requires less air than a P rated tire. Do to the stiffness of the side wall. Running p rated air pressure in an LT tire on a vehicle that came with p rated tires will cause the tire to crown in the center. That's why you see so many trucks and such with worn out centers on there tires and new looking side tread. Because they are running to much air pressure for what there vehicles weight.
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tjkj2002
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Not saying to run max psi but a LT tire does require more PSI then a P metric.
Usually 5-10psi more.
Those 3/4 ton and 1 ton pickups that you are seeing with worn center tread is because they are not using the truck as intended.Running around empty 99% of the time will do that and why there are 2 rear tire psi's listed for those trucks,loaded and unloaded.
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