Originally Posted by Dan Wong
Could you discuss this a bit more, I need a little bit more convincing.
My two dual wheels on the back are showing a few hairline cracks. It is a shade over 10 years old with about 95% tread left. To me, this is NEW
tires, it hold pressure, no leak or anything (other than age with a few hairline crack). I feel bad throwing out 4 perfectly good tire and the $$$$ goes with it.
I agreed with you- two new tires are better, but for economic reason, I am thinking of replacing one new tire on each side; pair it with one old tire until the tread wear out (say 50%). Am I thinking ok or is old age getting to me? Front tire will be new.
Don the issue is that without X-Ray and similar examination it is very difficult to know the condition of the structure of a tire. We engineers do know that rubber looses strength with time & temperature. While it is impossible to predict the exact number of miles or months
it will be until a tire fails we do know from experience that the probability of a tire failing increases rapidly after a number of years. In general it is felt that for motorhomes at 5 to 7 years tires need to be dismounted and inspected by a properly trained service person that works for the tire company (ie knows the components of the tire being examined). For trailers the time is shorter at 3 to 5 years.
Motorhomes are riding on borrowed time and the probability increases significantly at about 10 years so that is the generally accepted Max age for large RV tires with 5 to 7 as the max for trailers.
Now this doesn't mean all tires will fail at 10 years + 1 month but we are looking at both probability and potential for damage.
If you choose to gamble please don't complain to anyone here and hopefully if you have a failure there will only be minimal property damage to your RV and no one else will be involved.
The best plan I can suggest is to see if there is a local delivery or dump truck they will buy the used tires and scrub the tread off in a year.
The other plan would be to do a rolling change starting at say 7 years.
Replace the 2 fronts
then the next year move the fronts to one side on the rear and get 2 more new tires and place on the front
then the next year move those fronts to the other rear and get 2 more new tires for the front.