Goodyear Endurance Tire Pressure

[rid 05 198]

I am now running Goodyear Endurance tires on my trailer and they've got an 80psi maximum load rating. The tires are ST225/75R15 E. I've always run my trailer tires at maximum load capacity, but that was usually 60lbs max. Should I inflate to 80lbs? Do these tires have a different set of rules/standards since they are such heavy duty tires?

What is your load?

[MikeF]

What is your load?

A very commonly asked but unanswered question on these tire/pressure queries.

I have never had an unpleasant experience at the CAT scales, but very few boaters know the weight of their rigs and just guess.

Some use the chalk method instead of a weigh scale.

[Coastal Mountaineer]

CAT scales are the only way to really know your boat rig, ready for fishing, true weight. If they're all like the one I used, you will weigh 3 times. Once with your truck and boat hitched, once with the hitched rig but truck is off scales with just the rig on the scales, and once with just the truck on the scales. I had to go around and re-enter for each of the three weigh's.

It's not a simple process, but it's 200% better than trying to figure it out with pencil and paper.

[mikeky]

CAT scales are the only way to really know your boat rig, ready for fishing, true weight. If they're all like the one I used, you will weigh 3 times. Once with your truck and boat hitched, once with the hitched rig but truck is off scales with just the rig on the scales, and once with just the truck on the scales. I had to go around and re-enter for each of the three weigh's.

It's not a simple process, but it's 200% better than trying to figure it out with pencil and paper.

It can be done in 2 weighs.

1st weigh, boat hooked to truck. Steer axle on steer platform, drive axle on drive axle platform, trailer axle on trailer axle platform. Trailer axle platform will be the last platform towards the entrance and will be 2 or 3 sections bolted together.

2nd weigh, truck only. Steer and drive axles on their respective platforms.

Now you have individual axle and combined weights. You will know truck weight, and can calculate boat weight and tongue weight.

If you have a buddy at a grain elevator, quarry, concrete plant, scrap yard, or another facility that has a truck scale you can do it there as well. If it has a remote display, you can do it by yourself, if not, it would help to have someone at the indicator.

Truck and trailer, pull on scale one axle at a time, record weights. Truck only, record steering and both axle weights. Then calculate as above.

[MikeF]

It can be done in 2 weighs.

1st weigh, boat hooked to truck. Steer axle on steer platform, drive axle on drive axle platform, trailer axle on trailer axle platform. Trailer axle platform will be the last platform towards the entrance and will be 2 or 3 sections bolted together.

2nd weigh, truck only. Steer and drive axles on their respective platforms.

Now you have individual axle and combined weights. You will know truck weight, and can calculate boat weight and tongue weight.

If you have a buddy at a grain elevator, quarry, concrete plant, scrap yard, or another facility that has a truck scale you can do it there as well. If it has a remote display, you can do it by yourself, if not, it would help to have someone at the indicator.

Truck and trailer, pull on scale one axle at a time, record weights. Truck only, record steering and both axle weights. Then calculate as above.

X2

[fishnfireman]

Why can't you pull the trailer on a set of truck scales -- unhook and pull your truck off the scales -- weigh the trailer and boat?

[mikeky]

Why can't you pull the trailer on a set of truck scales -- unhook and pull your truck off the scales -- weigh the trailer and boat?

You can do this, but the only way to get accurate trailer tongue and trailer axle weights is to leave it hooked to the truck and then weigh the truck separate.

On a CAT or multi axle scale, you can drop the trailer, put the jack and axle(s) on separate platforms, but the weights may or may not be accurate as the jack is farther back than the tongue connection.

Or, just use the trailer axle weight (while hooked to the truck) to determine which tires and inflation pressure to use. But if you are taking the trouble to weigh it, you might as well get all the info that is available.

[krindgen]

No, he has E-series tires which max out at 80 or 85 psi look down the chart halfway and far to the right

OK, same argument based on load carried, he's not running anywhere near the tire's max. Didn't realize Endurance came in an E. I have the DD.....I mean D.

[jadatis]

This tire ST225/75 R15 has 2830 lbs maxload ATb80 psi.
First searched if an LT was available to see if maxload was higher given because given for max 65mph instead of LT 99mph. Not exact same size found but concluded this smaller size same maxload as if it was in LT.

Then made a axleload/cold pressure/tandemload list, with build in maximum reserve at wich trailer and cargo wont tremble apart.
For that I give 90% of calculated axle or tandemload for the cold psi for max speed used of 99mph.

Now your task is "ONLY" to determine axle or tandemload 99% accurate, the most tricky part, and your responcibility.

Axleload/cold psi/Tandemload
1826 lbs/ 26 psi / 3652 lbs
1951 lbs/ 28 psi / 3902 lbs
2075 lbs/ 30 psi / 4151 lbs
2199 lbs/ 32 psi / 4399 lbs
2323 lbs/ 34 psi / 4646 lbs
2446 lbs/ 36 psi / 4893 lbs
2569 lbs/ 38 psi / 5139 lbs
2692 lbs/ 40 psi / 5384 lbs
2814 lbs/ 42 psi / 5628 lbs
2936 lbs/ 44 psi / 5872 lbs
3058 lbs/ 46 psi / 6116 lbs
3179 lbs/ 48 psi / 6359 lbs
3300 lbs/ 50 psi / 6601 lbs
3421 lbs/ 52 psi / 6843 lbs
3542 lbs/ 54 psi / 7084 lbs
3662 lbs/ 56 psi / 7325 lbs
3783 lbs/ 58 psi / 7566 lbs
3903 lbs/ 60 psi / 7806 lbs
4023 lbs/ 62 psi / 8046 lbs
4142 lbs/ 64 psi / 8285 lbs
4262 lbs/ 66 psi / 8524 lbs
4381 lbs/ 68 psi / 8763 lbs
4500 lbs/ 70 psi / 9001 lbs
4619 lbs/ 72 psi / 9239 lbs
4738 lbs/ 74 psi / 9477 lbs
4857 lbs/ 76 psi / 9714 lbs
4975 lbs/ 78 psi / 9951 lbs
5094 lbs/ 80 psi / 10188/referencepress lbs
5212 lbs/ 82 psi / 10424 lbs
5330 lbs/ 84 psi / 10660 lbs
5448 lbs/ 86 psi / 10896 lbs
5565 lbs/ 88 psi / 11131 lbs
5683 lbs/ 90 psi / 11367 lbs

[bmas13]

I love the robust discussion. Thanks everyone for the very helpful information!