rim Ratings

[pitch]

Where do I find a definitive guide for the Max tire pressure rims are rated for?
Please don't answer with an opinion or what your brothers barbers sister told you.
I have a Ram 1500 that I run "C" rated lt's on. Max tire pressure 50#.
The same truck in the tradesman trim comes with "E" rated tires on visually identical rims. Service advisor at ram says they all are the same,but did not offer any documentation to bolster his words.

I have no need for "E's", so this is a curiosity thing. We see people on here constantly saying "Your Rims are not rated for 80#".

There is no pressure rating stamped into the rims so I imagine the info is buried in an SAE code stamped into the rim.
What say you?

[Huntindog]

pitch wrote:

I have a Ram 1500 that I run "C" rated lt's on. Max tire pressure 50#.

If that info is off of the trucks placard, then it probably isn't the max for the rim, but the tires that it came with.
You need to look at the rim pretty close.

On TT rims, it is sometimes a code, that can be looked up for the pressure rating... IIRCC, mine was a JJ---- something or other.

[Bedlam]

Ford's commercial fleet guides have rim ratings if you dig through the vehicle specifications. Perhaps you have the Ram equivalent. I will note that all the rims may not be listed but sometimes there will be footnote claiming a maximum rating with only a particular rim or derating when using another.

[BenK]

Yes it is...

PSI rating of the alloy's on my Silverado...on the back side





Wheel size info on the alloy's on my Silverado...on the back side




Wheel Load Rating on the alloy's on my Silverado...on the back side




Local Fire Engine's alloy wheels...on the front side

[pitch]

According to that the load rating is not required as part of the DOT stamp.

[BenK]

eHow.com, DOT Specifications for Rims

ehow.com wrote:

They may move too fast to read, but every rim on every tire on the road must comply with U.S. Department of Transportation (DOT) regulations. Certain information must be included on each tire rim for the convenience of tire dealers, manufacturers and consumers. The DOT states that these regulations are put in place to ensure safe vehicle operation.

Read more : http://www.ehow.com/list_7423898_dot-specifications-rims.html


Rim Information
The DOT requires each tire's rim or wheel disc to be marked with certain information for identification purposes. According to DOT regulation 571.120, the rim should be marked with the source of the rim and its size. The rim must also be marked "DOT" to indicate that it complies with DOT regulations. The date of manufacture should also be marked, either by use of a symbol or numerals.

Rim Markings
A rim manufacturer may have all the right information on the tire, but if it is not properly marked, it will be in violation of DOT regulations. According to Regulation 571.120, the markings on rims should be in lettering no less than 3 mm high. The lettering can be impressed on the rim or embossed with a height/depth no less than 0.125 mm. This information must appear on the outside or weathered side of the rim so that it can be easily read without having to take the rim off the wheel, according to the DOT.

Proper Rim Listing
According to DOT regulation 571.119, each tire manufacturer must furnish a listing of usable rims for their tires to the public. The tire manufacturer's dealers must have a complete listing of these rims and be able to furnish the information if requested. If this is not possible, the information should be included in at least one of many tire publications, such as those from the Tire and Rim Association or the Japan Automobile Tire Manufacturer's Association, Inc.

[BurbMan]

If the ratings are not visible on back side of the rim, then it is stamped inside....you must dismount the tire to see it. AFAIK all rims are required to be stamped with max PSI and MAX load ratings, some are easier to see than others.

[goducks10]

There in lies the problem. No one really knows except the engineer that designed the wheels according to the truck. Unless it's stamped on the rim then it's any bodies guess. Who you going to believe?

[blt2ski]

"USUALLY" I have found the stamped wt code on inner back side of the rim. If it is not there, nor does it have a code of some sort, I would not go over initial wt ratings per say.

But as some would say, the rim is a tool that holds the tire, so unless it is really weak per say, it should hold a few more lbs of pressure, the question becomes, how much more? then do you really need 80 lbs in LR E tires in a typical DOT LD Class 2 truck? my sons have LR E tires in a 7100 gvwr GM, and a Toyota tacoma, but neither run more than 40-50 lbs, otherwise they do not get a full contact width patch of tire on the ground, tires wear out sooner than later, stopping is not good, handling worst etc. I only run 50 lbs on my sw 2500 I am driving, unless loaded, as otherwise, with 3500-4000 lb the ra alone, 80lbs is too much.

Marty

[JIMNLIN]

You may have Rams std OEM wheel or one of their options. I would contact a Ram truck dealer for that info.

[Sandia_Man]

Our max psi was stamped on the rear as well, although rims make look similar I wouldn't take for granted that they have identical psi ratings. Most manufacturers whether truck of RV spec their rims no higher than they deem required for the stock tire they installed. I have not encountered any resource that states max psi for rims.

[Bombfixer]

On both my Ram 3500 and on my 5er the max psi rating for the wheels are stamped on the backside of the wheel. I had to crawl under both to find it but they were all clearly marked. On the 5er it read "max psi rating 110psi", on the Ram it says "80 psi maximum".