Wednesday, November 29, 2023


RV Tire Safety: How old is too old for RV tires?

With RV tire expert Roger Marble

For RV tire application, “How old is too old” is a tough question to answer because “it depends.”

Primary factors that affect the answer include:
1. Type of RV: motorhome, tandem axle trailer or single axle trailer
2. Cumulative temperature, i.e., how much time with tires below 60 F, below 70 F, below 80 F, below 90F, above 90 F, above 100 F, etc., up to above 140 F
3. Actual reserve load
4. If a trailer, how many times you backed into a parking spot
5. Do you use white tire covers or is the RV parked in full shade?

Yea, a lot to consider, but each of the above items can shorten tire “life.” Would it be possible to construct a formula or spreadsheet with answers to the above to calculate the answer?  Yes, but I doubt it would be worth the effort as the life of one brand or size would probably end up with different detailed factors. So let’s just consider some of the items I listed so you may gain a better understanding of “tire life.”

1. Type of RV. This is where “interply shear” (IPS) (a force that is trying to tear the belts off the body of a radial tire) comes in. Based on computer simulation this shear or tearing force is 20% or greater in tires applied to multi-axle trailers than if the same tire was applied to a motorhome, even with identical weight. For those that care, there are a number of posts on IPS on my blog if you really want to understand the background and how this force affects tires.

2. Heat. This is the number one “killer” of tires if we set aside the obvious failures due to loss of air pressure. In fact, even the loss of air pressure results in excess heat that can lead to rubber reversion or even melting of body cord which leads to many “blowouts.”

Heat damage is cumulative and has a MAJOR effect on tire life. The reason for this is that rubber is always “curing.” In technical terms, this means the molecules of carbon and sulfur are continuously linking, although at a slower rate when relatively cool 70 F and below, and the rate of chemical reaction doubles with each increase in temperature of 18 F. I have a number of links to scientific papers on the chemistry of tire curing in THIS post.

Click image to enlarge.

It is also important to understand that the hottest area of a tire cannot be measured with a heat “gun” or even with a TPMS. Here is a graphic showing the relative temperature in different areas of a tire. The internal red area can be 20 F hotter than the rubber just 3/8″ away and the range of temperatures in this example is 80 F, so measuring at the correct location is critical as well as very difficult as it takes specialized needle probes. Also, this is the location of the highest level of interply shear.

3. Reserve load.  This is the difference between a tire’s load capacity at the cold inflation number in the tables vs. the actual measured load on a tire. Greater reserve load means cooler running temperature. See 2. above

4. Backing into a parking space. This is something few think about but in extreme cases, the interply shear might get to 100% higher in a tandem axle trailer when doing a tight turn into a parking space. This high tearing force can initiate cracks in the rubber which can just grow and they never “heal,” which can lead to belt separation many hundreds or thousands of miles later.

5. Tire covers.  See my post on using white tire covers.  Yes, this simply goes back to cumulative heat. See 2. above.

Long-term readers of my blog may remember my post on how to maximize tire life.

One thing that is true is that Michelin and some other tire companies have set 10 years at the maximum life of a tire no matter what it looks like. This does not mean that no tire will fail due to “age” or the cumulative effects of the conditions I have outlined above. All of these conditions simply are shortening tire life from 10 years down to maybe as little as one or two years in extreme cases.


Read more from Roger Marble on his blog at



Roger Marble
Roger Marble
Retired Tire Design and Forensic Engineer w/50+ years of experience. Currently has Class-C RV. Previous Truck Camper, Winny Brave, Class-C & 23'TT. Also towed race car w/ 23' open trailer and in 26' Closed trailer. While racing he set lap records at 6 different tracks racing from Lime Rock CT to Riverside CA and Daytona to Mosport Canada. Gives RV and Genealogy Seminars for FMCA across the USA. Taught vehicle handling to local Police Depts



0 0 votes
Article Rating
Subscribe to comments
Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Oldest Most Voted
Inline Feedbacks
View all comments

Austin (@guest_76649)
3 years ago

I have the date when I purchase new tires. When I see cracks regardless of the date I do the deed again.
And some times those cracks show up after 36 months.

Steven schultz (@guest_50722)
4 years ago

Just recently I purchased a 2014 Thor 30 foot RV had one tire disintegrate on me and when I had a change to the owner of the tire Company said my tires were manufactured in 095 years before the RV checked your tire records and see when your tires were manufactured do not go by the RV manufacture date

Roger Marble (@guest_50809)
4 years ago
Reply to  Steven schultz

Yes most RVs come from the factory with tires that are one or two years old on the data you bought the RV.

Thomas Smithbrother (@guest_50392)
4 years ago

A great article with lots of valid information. I have read on several blogs people changing out their tire way too early all due to fear.

Sign up for the

RVtravel Newsletter

Sign up and receive 3 FREE RV Checklists: Set-Up, Take-Down and Packing List.