Upgrade Tires

JJBIRISH wrote:
....snip....to unrelated verbage.....

.....That means that there is no downside to using a load range D or load range E in place of a load range C tire .
A higher rating is a higher rating ..:B:B:B....

Jack, there are many things you and I agree on, but I think I am going to have to go a slightly different path than you on part of this one. If my reading of the SAE standards are correct, and also based on a LOT of other reading and asking questions of some in the industry, I feel it is likely safe to say that we can substitute up to a LR D tire on a rim that is "certified" to carry a LR C tire. The key part of that phrase is likely, "did the wheel manufacturer certify the wheel meets SAE standards that are applicable".

Now then, to go all the way from a LR C to a LR E ( and more to the point, to carry 80 psi in this hypothetical case ) may in fact going beyond the pressure related design standard of the wheel. So on that part of your statement ( LR C to LR E ) I agree with you, not a good idea.

Fellas, I think the real deal bottom line of all this pressure related standards and potential failures is to, as always, do your homework, and know what the design standards are of your particular wheel ( and tire ). It does little good for me to state to you all what the standards are that my wheels meet, unless yours are identical.
I can say that in every single case when I have had correspondence with wheel and tire manufacturers, as well as trailer builders, when I ask very specific, carefully worded questions, I have always received equally clear responses from them.

There have bean pictures and posts before shoving rims split where welded in center or at the bead as stated previously, they du have pressure ratings even if not stated and may have a higher rating than shown by TT manufacturer but op to u to find out from maker of rim before increasing pressure. Good luck .
Frank

Which is it JJ ?
Does the tire fail first ?
Or does the wheel fail first ?

Is there any person on this forum that has blown up a steel RV wheel due to over inflation ?

PartyMarty wrote:
JJ , if I understand correctly it is your belief that the steel wheel will fail before the rubber tire will fail due to over-inflation . Is that correct ?

no that is not correct, and is not what I said,
but it could be correct with all the dynamic stresses the rim is placed under in use and especially if it is also well beyond it’s designed pressure ratings…

now maybe you can answer the question that were posed with something verifiable…

where did you get the percentages you directly quoted???

If rim PSI ratings are so unimportant,

Explain the rim ratings for the 5 or 6 rims I posted that don’t seem to have any relationship to a tire (because they were sold as a rim, not a tire/wheel)???

explain why they are psi rated at all if you can use any tire and at any pressure you desire???

AND

is it the Maxxis tire that has earned a good reputation that you dislike so much???

or is it the cheer leaders that have had success and show loyalty to a product they believe to be the best in a given category of tires???
not unlike Honda generator and Hensley hitch owners do…

if it’s the cheerleaders please define the term as you see it so it can be discussed intelligently???

if it’s the tire express your disagreements with your reasons and some backup information???
again so it can be discussed intelligently…

and especially,

I would bet you include me in that class of cheerleaders… if so, in all fairness how about backing that up with some facts??? Please???

Your posts opens many more questions that they have answer… but we will leave them alone for now…

That means that there is no downside to using a load range D or load range E in place of a load range C tire .
A higher rating is a higher rating ..:B:B:B

Regarding inflation pressure standards for trailer wheels, if I am reading the manual correctly, the appropriate standard is SAE J1204.

It is of course up to each individual owner to determine if the wheels he has are built to the correct standard. You might have to contact the company the builds the wheel to answer that.

If you look at table 3 on page 6 of this document it shows the inflation pressure for the test:

http://www.autoparts-standard.org/index/images/userfiles/media/SAE%20J1204v001.pdf

From my reading on the subject, this minimum pressure of 65 psi is also observed in the test procedure for SAE J2530 and also SAE J328

65 psi is a load range D tire max pressure, so for those who are currently using a load range C ( 50 psi ) and are wanting to increase to a LR D, these standards are good news.

Perhaps Barry ( capri racer ) would like to weigh in on this if he has anything to add to my references to these SAE standards.

Regarding the advisability of changing OE tires of one load range to a tire of the next load range up, I have found numerous tire companies that state on their consumer websites that this practice is acceptable.

JJ , if I understand correctly it is your belief that the steel wheel will fail before the rubber tire will fail due to over-inflation . Is that correct ?

PartyMarty wrote:
Is it your belief that the steel wheel will fail before the rubber tire will fail due to over-inflation ?

You said this no one else, but it is possible and you are cautioned about over pressuring the tire to seat a bead… many of rims have failed while being inflated…


Increasing the PSI is a major method used by the tire manufacturers to carry additional load .
We see this in LT and ST and commercial tires (100 psi plus ) .

While using tires and rims created to accept the load and pressure…


I think you are reading something into a chart that has nothing to do with the wheel capacity to carry additional psi Capriracer…

Reading the charts, not into them, and no one has shown that to be wrong…


Maintaining that nobody should inflate to 65 or 80 PSI robs all of the uninformed from making the rational choice to move to a load range D or load range E tire .

Again no one but you are making this claim… no one is being robbed of anything but suggesting blindly to inflate to 80 psi may rob the as you say uninformed from making the rational choice to move to a load range D or load range E tire …


The Maxxis Cheerleaders want to rob us of the rational choice .

Now how about explaining your real problem…



is it the Maxxis tire that has earned a good reputation that you dislike so much???

or is it the cheer leaders that have had success and show loyalty to a product they believe to be the best in a given category of tires??? not unlike Honda generator and Hensley hitch owners do…

if it’s the cheerleaders please define the term as you see it so it can be discussed intelligently…

if it’s the tire express your disagreements with your reasons and some backup information… again so it can be discussed intelligently…


CapriRacer has posted that the wheel manufacturers do not have PSI as a factor in rating their wheels . Only a weight rating .

Then CapriRacer with all due respect is wrong and I doubt he said exactly what you are saying, and if he did he should come forth with the evidence to support he professional opinion…

Lets be safe out there .

Please do and it starts with being informed and making smart choices…

Does your RV steel wheel have a stamp that says " Maximum 50 PSI " ?

My RV steel wheels have a black and yellow sticker rating the tire and wheel assembly as supplied to the trailer builder… it has a second sticker in the valley of the rim stating the maximum PSI for the rim is 70…

BTW, I would bet you include me in that class of cheerleaders… if so, in all fairness how about backing that up with some facts… please…

Is it your belief that the steel wheel will fail before the rubber tire will fail due to over-inflation ?
Increasing the PSI is a major method used by the tire manufacturers to carry additional load .
We see this in LT and ST and commercial tires (100 psi plus ) .
I think you are reading something into a chart that has nothing to do with the wheel capacity to carry additional psi .
Maintaining that nobody should inflate to 65 or 80 PSI robs all of the uninformed from making the rational choice to move to a load range D or load range E tire .
The Maxxis Cheerleaders want to rob us of the rational choice .
CapriRacer has posted that the wheel manufacturers do not have PSI as a factor in rating their wheels . Only a weight rating .
Lets be safe out there .
Does your RV steel wheel have a stamp that says " Maximum 50 PSI " ?

please explain these rim ratings.. same load rating but different Psi ratings…

Wheel Size 15 x 6 in - Bolt Pattern 5 on 5 in - Load Rating 2,600 lb. - PSI 60 lb.
Wheel Size 15 x 6 in - Bolt Pattern 5 on 4.50 in - Load Rating 2,600 lb. - PSI 80 lb.

Then these rim ratings… different load ratings, same Psi ratings…

Wheel Size 15 x 6 in - Bolt Pattern 6 on 5.50 in - Load Rating 2,600 lb. - PSI 60 lb.
Wheel Size 15 x 6 in - Bolt Pattern 6 on 5.50 in - Load Rating 2,850 lb. - PSI 60 lb.


All are steel trailer wheels, all are 15x6, two 5 bolt and two 6 bolt, all from the same supplier, all have a zero offset, three have the same 2600 pound load rating one of those rated for a LR E and two are rated for LR C… the one rated for a LR E tire is only 5 bolt and has a smaller bolt circle…


explain why they are rated at all if you can use any tire you desire...