Quite often, tyres are forgotten – which can sometimes lead to serious problems. It is important to not forget about them, especially they are your RV’s main point of contact with the road.
A tyre placard will show you the correct tyre size and pressure for your vehicle. This will most likely be in the door jam of your motorhome or tow vehicle, or on the A frame of your trailer.
Reading Your Tyre Sidewall
Your tyres contain useful information including the type of tyre, loadings, and tyre dimensions, and this is printed on the sidewall. Additionally, the sidewall can tell you how old your tyre is. The below diagram outlines how to read the markings on your tyre:
A – The brand, make and model of the tyre.
B – This number shows the tyre width in millimetres measured from sidewall to sidewall.
C – This number shows the height of the tyre as a percentage of the section width (B). This P265/60 tyre shows the section width is 205mm and the height is 60 per cent of that. The lower this number, the lower the tyre profile.
D – This letter shows the type of construction. R stands for radial, B for Bias.
E – This number represents the rim diameter which fits the tyre. This measurement is always in inches.
F – This number is checked against a chart to identify the maximum load the tyre can carry at the speed indicated.
G – This letter represents the maximum safety speed. Passenger tyre speed ratings begin at N (140km/h) and continue through to Y (300km/h).
H – After DOT you will see information on the manufacture date of the tyre. The first code represents the plant the tyre was made at; however, the last four digits are the most important. The first two digits indicate the week it was made, and the last two digits indicate the year. Therefore, 4918 is the 49th week of 2018.
Age of Tyres
Tyres degrade with age! Even if your tyres look near new and have plenty of tread, they may be unsafe. Sunlight and heat are the main causes of tyre degradation and, depending on where your trailer is stored and the climate of your area, your tyres may degrade faster than other locations. It is worthwhile getting your tyres checked for degradation by a reputable tyre business every year for tyres that are over 5 years old. After ten years, they will need to be replaced regardless of the tread left.
The age of the tyre can be found on the side wall of your tyre as shown above.
A shockingly loud blast rocked the cabin. We were traveling at about 90km. The inside rear tyre exploded. We have a 32-foot Nullarbor motor home. The blast blew the wheel arch apart ripping the metal lining out and blowing the side panel off the RV. It damaged the fuel entry pipe and embedded steel into the outside tyre. The damage was a real mess and an incredibly frightening experience. Always keep your tyres under the use by date. Not enough is done to make the market aware of this...My explosion is a great reminder for me to keep this in mindTestimonial — CMCA Member
Tyres on RVs typically carry more weight than standard vehicles which makes it even more important to have the correct tyre pressure. The tyre placard will stipulate recommended tyre pressure for your rig, and we recommend checking your tyre pressures before heading off on your trip.
The important issue of RV weight strikes again! Overloaded tyres are a common occurrence for motorhomes and caravans. Overloaded tyres generate excessive heat due to increased flexing. Over time, excessive heat damages the bonding between the tyre components, creating potential tyre disintegration whilst in use. So, make sure you know your vehicle weight.