Your Ad here
Be sure to sign up for the weekly RV Travel Newsletter, published continuously every Saturday since 2001. NOTE By subscribing to RVTravel you will get info on the newest post on RV Tire Safety too
. Click here.
Huge RV parts & accessories store!
You have never seen so many RV parts and accessories in one place! And, Wow! Check out those low prices! Click to shop or browse!

Friday, March 26, 2021

Do you have or need a spare?

 Reasonable question. I have previously published some information on having a spare HERE, but for those that want a quick answer....

Most Motorhomes already have receiver for hitch so adding a spare carrier there should be relatively easy. Amazon has some and I have seen smaller models starting at $40.

One way to cut cost is to put one of your old tires under a cover as a spare.
Used wheel from junk yard should also cut the cost.

Re: Tire cover. I would consider a WHITE cover a necessity unless you want to bake the life out of the spare mounted outside the RV.

RE jack & tools. Be sure you know what you are doing and have all the tools you might need including flat board & steel plate if you need to jack on soft ground. If you don't already have the tools I suggest Harbor Freight, as hopefully you will never need the tools and if you do they will not get much use.
 Will you be able to physically lift the tire and mount it on the RV? You will need correct 6 point socket and a 2' breaker bar and if you have a Motorhome with dual tires in the rear an extension. You should practice at home so you know how much effort is needed.
Here is a YouTube one guy made. Your system may be different so after watching, you can go and do a practice on your RV.
Even if you can't do the physical job having a spare will probably pay for itself as any road service should be able to change the mounted tire so you are not confronted with having to buy a mismatched new tire @ 2x the normal sale price.

Friday, March 19, 2021

Tire covers. Can Black be OK?

 It might help to first review the original post that included actual DATA on the subject of tire covers, and remember that old rubber is more likely to crack and fail than "younger" softer rubber, so keeping your tires as "young" as possible is a good thing to do.

So if you have a Class-A with no covers as seen here...

Is the only option to run white vinyl covers, as seen here?...

or could you run the "screens" as seen here?...

Well I have collected some temperature measurements and I will admit that initially I was surprised to learn that the tires behind the black mesh were about the same temperature as those under the white vinyl. after thinking about the situation, it occurred to me that it was possible for the mesh to shield the tire from direct sunlight as the angle of sunlight does not always line up with the openings in the mesh, while at the same time allowing air-flow.

So if you have a Class-A with the normal flat sides you do have an option. 

The "Tire Shades" made by ShadePro and maybe other suppliers can protect your tires from the Sun's heat.

I know of no "spray" or tire "treatment" that can keep a tire as cool as putting the tire in the shade.


Friday, March 12, 2021

How to adjust tire pressure when inflating in a heated garage

 I found a chart that covers how to adjust tire inflation when you are inflating tires inside a heated garage (heated to 65F) when the truck or RV will be moved to a very cold location. I am hoping that when you study the adjustment you will better understand what, if any adjustment is to be made with your vehicle.



Friday, March 5, 2021

Question about tire company building bad tires. Are China Bombs built on purpose?

This as a long post but I wanted to share the type of questions i sometimes get.

" Good Morning' Roger. First, thank you for helping to dispel the misinformation about the care & feeding of consumer tires. 

    My training & work history is in the military & general aviation world. After a 24 year Air Force career and 17 years with Cessna in Wichita KS I've learned a great deal about tires. I've also had a near miss with some tires back in the day. 
   I had a set of Light Truck tires on our '84 Ford E350 15 passenger van. Not long after a tire story broke in the news, I looked at the tires installed on our van. No defects noticed, inflation correct, continue in service. 4 days later, while on the road to KC from Wichita I felt a vibration develop. I pulled to the shoulder and discovered a blister in the sidewalk of a rear tire. I installed the spare & the trip continued without incident.
    The following Monday I presented my defective tire to my local tire dealer. He was very apologetic for the defective tire. He replaced the remaining tires with a set of Bridgestones of comparable size. The whole incident was handled well.
   At the time I couldn't get the one tire that failed. I wanted to perform an autopsy of sorts. The dealer wasn't having any of that, which I understand. At the time the problem with the tires was explained to me that the sidewall de-lamination was caused by an incomplete cure process. The process was incomplete because a manager thought the vulcanizing process would run its course even after the tire was removed from the press. It was later reported that an inferior compound was used in the process. 
    So, I guess my question is, in the Light Truck tire incident, was it improper substitution of a material or a management failure in order to increase production that lead to the failures? Do Chinese made tires exhibit similar problems? Can the NTSB outlaw them? It's all above my pay scale. Just want to see some reliability in RV tires.
   I will continue to recommend your Blog to others in an effort to combat the misinformation surrounding tires. 
   Reply when you get time. It's a cold Sunday morning here & I'm working on the second cup of coffee. In this day & age, I don't do anything in a hurry & my upper arm is getting cold as my sleeve is rolled up waiting on my vaccine, but we'll survive. Stay safe, stay warm.
My answer:
Where / how did you get the information that the tire with the sidewall problem had some "inferior" compound?

Without a lot more data it's hard for me to pass judgment on tires made in the early 80's. I can however relate a personal experience that I have written about previously. This may shed some light on tire quality.
By late 2000 my primary job responsibility had become doing forensic tire inspection and analysis. I came across one almost new (weeks old) passenger tire with the steel in the belt having lost all adhesion to any rubber. There was only one tire and at the time no report of other similar tires. Many times single tire issues get set aside as a "single data point" is hard to establish any trend.  A few weeks later I was presented with two more tires with belt issues and upon conducting an autopsy discovered these tires had steel in one of the two belts, BUT NOT BOTH, having no adhesion to the rubber. The other belt had normal levels of adhesion. Recalling the single earlier tire I dug deeper.
Eventually, after some investigation and some test results from the chemistry lab, it was confirmed that a single batch of approximately 145 lbs of the rubber had been improperly labeled in the factory and built into about 150 tires. I notified the VP of Corporate QA and a recall was initiated with the permission of NHTSA (the agency like NTSB but dealing with automobiles, not commercial vehicles such as buses or airplanes). The recall covered some 6,000 tires as the effort required the recovery of all tires that were cured the week when the factory mistake was made.
Technically we knew that with only 145 lbs of rubber involved and the specific process used in that plant that a maximum of 150 tires could have been affected but since tires are recalled based on the DOT serial and all tires made in any one week carry the identical serial that was the only option.  It turns out that most of the tires were still in the warehouse which made completing that recall easier as many times even when recall notices are published a significant portion of the public does not pay attention.

Your suggestion that some inferior material was intentionally used in your LT tires just doesn't seem plausible as NHTSA would have ordered a recall of all suspect tires if there was data that supported the idea that some substandard material had been used.

In modern tire manufacturing, most rubber compounds are used in many different sizes and types of tires. I would say that the sidewall rubber in the Light Truck tire would probably have been used in most if not all LT tires being made at that time which would have involved millions of tires.

It is also true that tire store dealers do not get detailed training in tire forensics so sometimes they tend to simplify the explanation for a problem. When tires are "adjusted" and replaced however those tires are sent to be inspected, in detail, by engineers with the necessary training and experience. If manufacturing errors, as found in my example, are confirmed, appropriate action is taken as there are serious financial fines for knowingly allowing tires that do not pass DOT requirements to be sold or used.

All tires sold for highway use are certified by the tire manufacturer to be capable of passing the DOT test requirements and the data I have seen, including a number of tires made in China, shows that the tires meet the DOT requirements. The "China Bomb" concept is a combination of improper use and improper understanding of statistics. It is a known fact that a majority of tires on RV trailers are overloaded. Also, some 90+% of the tires applied to RV trailers were for a number of years were made in China. With these known facts is it any wonder that there were tire failures on RV trailers and that most of those failed tires had been made in China? Many people jumped to the incorrect conclusion that since very few tires failed on their passenger cars or pick-ups and that the tires on their cars and pick-ups were not made in China. That the China-made tires must somehow be "defective" even while never being able to identify any specific "defect".

A side issue. You mentioned a desire to "perform an autopsy of sorts" immediately raises the question in my mind of how and what you thought you would do when doing your first tire autopsy? I suggest you read these blog posts where I mention "Autopsy" and ask yourself if you would have noticed or been able to identify the evidence I pointed out in these examples. And if you had noticed the details do you think you would have reached the same conclusions I did?

Hope this gives you something to read and think about on a cold day in March.