Tire pressure?
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I put 305x75x16 bridestones on my truck. what tire pressure should i be using? the recomended for the truck that is on the inside of the door or the one on the tire?
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Neither one.
The one on the doorpost is only when you have stock-size tires and are loaded to the gills.
The one on the tire is only when you are loaded to near the max weight included in that same area of the sidewall.
I suspect you meant you put LT305/70R16 tires on your truck. Those have a weight index of 118, which means max of 50 PSI resulting in a max of 2,910 pounds of weight capacity.
But when you have less than 5,820 pounds on the rear axle, then you'll need less than 50 PSI in those tires.
Darling Wife is hollering right now, so I'll be back later to add the load/inflation table for that size tire.
I put 305x75x16 bridestones on my truck. what tire pressure should i be using? the recomended for the truck that is on the inside of the door or the one on the tire?
[/ QUOTE ]
Neither one.
The one on the doorpost is only when you have stock-size tires and are loaded to the gills.
The one on the tire is only when you are loaded to near the max weight included in that same area of the sidewall.
I suspect you meant you put LT305/70R16 tires on your truck. Those have a weight index of 118, which means max of 50 PSI resulting in a max of 2,910 pounds of weight capacity.
But when you have less than 5,820 pounds on the rear axle, then you'll need less than 50 PSI in those tires.
Darling Wife is hollering right now, so I'll be back later to add the load/inflation table for that size tire.
Joined
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1,271 Posts
[ QUOTE ]
Darling Wife is hollering right now, so I'll be back later to add the load/inflation table for that size tire.
[/ QUOTE ]
Let me get that for you while you take care of your wife...
LT305/70R16
35 psi - 2270 lbs.
40 psi - 2465 lbs.
45 psi - 2680 lbs.
50 psi - 2910 lbs.
Darling Wife is hollering right now, so I'll be back later to add the load/inflation table for that size tire.
[/ QUOTE ]
Let me get that for you while you take care of your wife...
LT305/70R16
35 psi - 2270 lbs.
40 psi - 2465 lbs.
45 psi - 2680 lbs.
50 psi - 2910 lbs.
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18,824 Posts
Good for you! But his max on that Bridgestone tire is 2,910 pounds capacity @ 50 PSI.
So:
LT305/70R16
35 psi = up to 2270 lbs. per tire or 4,540 pounds per axle.
40 psi = up to 2465 lbs. per tire or 4,930 pounds per axle
45 psi = up to 2680 lbs. per tire or 5,360 pounds per axle
50 psi = up to 2910 lbs. per tire or 5,820 pounds per axle
Load the truck the way you normally have it when "unloaded". You, your sweetheart, the puppydog, toolbox full of tools, cooler full of cool, stuff behind the back seat, trailer hitch drawbar, etc. But no trailer. Then go to a CAT scale and fill up with diesel. Then weigh the "unloaded" truck. Then apply the above load/inflation table to your truck.
Example: Front axle weighs 4,700 and rear axle weighs 3,300. So you need 40 PSI in the front tires and 35 PSI in the rear tires when "unloaded".
Next, load the truck for a towing trip. Load the trailer for a towing trip. Then go to the CAT scale, fill up with diesel, and weigh the truck and trailer.
Example: Front axle weighs 4,900 and rear truck axle weighs 5,750. So you still need 40 PSI in the front tires, but 50 PSI in the rear tires.
Warning: If your wet and loaded rear axle weighs more than 5,820, your tires are overloaded. Only an idiot would drive at highway speeds with overloaded tires. /ubbthreads/images/graemlins/eek.gif
So:
LT305/70R16
35 psi = up to 2270 lbs. per tire or 4,540 pounds per axle.
40 psi = up to 2465 lbs. per tire or 4,930 pounds per axle
45 psi = up to 2680 lbs. per tire or 5,360 pounds per axle
50 psi = up to 2910 lbs. per tire or 5,820 pounds per axle
Load the truck the way you normally have it when "unloaded". You, your sweetheart, the puppydog, toolbox full of tools, cooler full of cool, stuff behind the back seat, trailer hitch drawbar, etc. But no trailer. Then go to a CAT scale and fill up with diesel. Then weigh the "unloaded" truck. Then apply the above load/inflation table to your truck.
Example: Front axle weighs 4,700 and rear axle weighs 3,300. So you need 40 PSI in the front tires and 35 PSI in the rear tires when "unloaded".
Next, load the truck for a towing trip. Load the trailer for a towing trip. Then go to the CAT scale, fill up with diesel, and weigh the truck and trailer.
Example: Front axle weighs 4,900 and rear truck axle weighs 5,750. So you still need 40 PSI in the front tires, but 50 PSI in the rear tires.
Warning: If your wet and loaded rear axle weighs more than 5,820, your tires are overloaded. Only an idiot would drive at highway speeds with overloaded tires. /ubbthreads/images/graemlins/eek.gif
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1,271 Posts
[ QUOTE ]
Good for you! But his max on that Bridgestone tire is 2,910 pounds capacity @ 50 PSI.
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Sorry, did not notice what his tire load range was when I put up the chart, so I gave you the full chart to work with. I will correct it so it is accurate for his tire.
Good for you! But his max on that Bridgestone tire is 2,910 pounds capacity @ 50 PSI.
[/ QUOTE ]
Sorry, did not notice what his tire load range was when I put up the chart, so I gave you the full chart to work with. I will correct it so it is accurate for his tire.
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