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Thursday, April 23, 2015

The Use Of Internal Balancing Materials and/or Coolants In MICHELIN® Truck Tires

I hope this answers the questions some have about the use of alternate materials for tire balancing.

The Use Of Internal Balancing Materials and/or Coolants In MICHELIN® Truck Tires

The use of internal balancing materials and/or coolants (such as powders, liquids, gels and/or beads) in MICHELIN® Truck Tires does not automatically affect the tire warranty unless the internal balancing material and/or coolant has a high water/moisture content or that it is determined that the internal balancing material and/or coolant has adversely affected the inner liner, casing plies, or the performance of the tires.

Prior to using any type of internal balancing material and/or coolant, Michelin strongly recommends that the customer make sure the internal balancing material and/or coolant has been tested and certified by the internal balancing material and/or coolant manufacturer as being safe for use in tires. Water/moisture content testing should be included in the certification process. Any product with a water or moisture content greater than 3% as measured by the Karl Fisher Method (ASTM D6304) will automatically void any mileage, number of retreads and/or time warranty.

In addition to the forgoing, please refer to the Michelin Truck Tire Operator’s Manual and Limited Warranty (MWE40021) for a general discussion of what is and is not covered by the warranty.

NOTE: Please consult Michelin prior to using internal balancing materials and/or coolants in any MICHELIN® tires that have sensors in them. The internal balancing materials and/or coolants may adversely affect the performance of the sensors.

For additional information, please contact your local Michelin sales representative or contact Michelin using the website at

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Tuesday, April 21, 2015

Links to Load Inflation tables

Almost all tire companies follow similar load formula calculations in the USA, Europe and Asia. BUT minor differences occasionally occur due to doing calculations in inches and pounds vs millimeters and kilograms as there is rounding that takes place along with some minor differences in some "K" factors. Also some sizes have been around for decades so their load capacities may not match the formulas exactly but are just accepted as acceptably close. So there are minor variations. This is why it is best to use the tables published by the company that makes your brand of tire.

Sometimes this is easy because you use one of the big name companies such as Goodyear or Michelin while other times you may find you have tires that are not actually made by the company with the name on the sidewall but are in fact just imports made in common molds with changeable nameplates.

This post will be updated when I learn about a company posting load inflation tables for their line of tires.  If you find an error or omission, please drop me an email (address under my picture on the right) with the link that needs correcting or new link and I will update this post. That way you can bookmark this page and save it for future use.

I plan on listing the links base of alphabetical list of the tire company name.
To the best of my knowledge Both Goodyear and Bridgestone/Firestone follow the Tire 7 Rim Association (US) published tables so you can simply look at their tables for the numbers.
Last updated April 28 2015

Links to Load Inflation charts, How to Weigh your RV worksheet and related material. Note Bridgestone "Medium and Light Truck data Book includes Load inflation tables for 16" and larger tires for both Bridgestone and Firestone brand tires.

Carslile  Has product info and size list but no Load Inflation tables However since they only have St type tires which I suggest always be run at the inflation pressure molded on the tire you can use the max load info to confirm you are running under the tire max by at least 15% for longer tire life while still maintaining the tire max inflation. 

Double Coin truck tire
Load & inflation for 19.5" and larger
 Firestone Truck Tires
Click on Resources to find list of tire Data books and Load Inflation tables for 17.5" and larger truck/bus tires

General truck tires
Load Inflation tables

RV tire information including link to Load & Inflation tables

Product info page and links to their technical information.
Note they show both P-metric and "Euro-metric tires that do not have a P prefix but based on the inflation these are basically passenger type tires even though some are listed under "Light Truck". Only their "Road Venture has actual LT type tires listed.  They do have 19.5 and 22.5 size tires.

Tire data on LT tires but no Load Inflation tables.

MAXXIS Trailer tires
Tire data on ST tires but no Load Inflation tables.

MAXXIS Trailer Load & Inflation tables

RV Tire guide and links to Reference Materials and Load Inflation tables  for 16" to 24.5" tires in RV application. NOTE many of the Michelin tables are not based on single tire loads but axle loads so you will need to divide the Michelin numbers by 2 for Fronts and by 4 for dual position individual tire laoding. This just adds a bit of confusion to your calculations. I also am aware that a number of Michelin tires do not follow the US TRA tables so if you are using Michelin brand you really do need to use their tables.

Sailun does not publish tables only the tire max load. They say to follow Tire & Rim tables

Sumitomo you can download their booklet
Load Inflation table on pg 19

Towmax  does not publish tables only the tire max load.

RV tire care and Load & Inflation tables

Uniroyal LT size info. They say to use the Michelin Load & Inflation tables. "It's important that you get all the safety-related materials that come with the purchase of new Uniroyal passenger and light truck tires. If you did not receive a warranty book, you can download one at If you did not register your tires, please take a moment to do so at Registering your tires is easy and takes just a minute."

Info on their commercial tires.  They have a "tool" that will calculate the minimum inflation for a specific axle load. Only problem I see is that they are assuming an exact 50/50 split which is not the norm for RV application.

 Others will be added when the tire company responds to my request for a link, or when someone lets me know about a link.

General information

How to read a tire Load Inflation table
Barry's Tire Tech

National Highway Traffic Safety Administration
Tire Safety

Air Pressure, Temperature variation
Tire Rack

Passenger tire inflation w/video

The Tire & Rim Association. Where to buy Industry Standards books

GM view on tire safety

MasterCraft tire Education

Rubber Manufacturers Association
Links to Tire Safety information
RV Safety Education Foundation
RV education and tire weighing service

Truck Scales

CAT Scales
Truck Scales

General information and weight calculations for trailer owners

Subscribe to the weekly newsletter or one of our other newsletters about RVing. Great information and advice. Now in our 14th year. Learn more or subscribe.