It is impossible to predict when tires should be replaced based on their calendar age alone. However, the older a tire the greater the chance that it will need to be replaced due to the service-related evolution or other conditions found upon inspection or detected during use.
For some reason that old wives tale of five to seven years keeps hanging around even though the tire companies themselves say it's not right.
YUP - exactly!
With all the OTHER paranoia running rampant these days, I sure don't want, or need, to start carrying around a calendar to be sure I'm swapping tires "on schedule" regardless of visual condition!
My Rving buddy is a tire failure expert - has lost about 7 tires to blowouts in the last 5 years or so - once with us right behind him. He had one Goodyear tire fail at 250 miles - no evidence of road hazard, and he religiously monitors tire PSI.
SO - to be "safe", maybe HE should watch the calendar AND odometer - and install new tires at 100 miles, "just to be safe"?
When WE are out traveling, I prefer to leave paranoia back at home!
(OH - and at 75 years old, I've only had *2* blowouts in my life - one was a road hazzard, dunno what the other was...)
John Day....|'88 Winnebago Super Chief 27ft. Class A
Eastern .....|'88 KIT model 240 24 ft. 5er
Oregon ......|'02 Dodge/Cummins 2500 Quad Cab