Tire pressure before going south
I am curious what others do about air pressure in your fifth-wheel tires. If you set it at proper PSI in the north at 30 degrees and then end up in FL at 90 degrees, what effect will that have on the ...
Forum Discussion
laknox wrote:rdemore wrote:
I just returned from Christmas in Cocoa Beach. We left Tn with the tires at about 78 psi cold. I have TPMS on the trailer, and by the the time we got to Atlanta the pressure was around 85-86 psi. Just south of Atlanta, we had a blowout, and the next morning a 2nd blowout. Replaced the two tires with Goodyear Marathons (only option on Sunday morning) and they set the pressure to 70 psi and suggested I look at the camper recommendation. I found it on the name plate and it was 65 psi.
Well, with all that said, two blowouts in 200 miles, no spare for the 2nd, I am curious about what happened and if air pressure had a effect. The two tires that blew were put on summer 2012.
What was the load rating on the tires that blew? If they were D-rated, you were over-pressured from the get-go; if E-rated, they =should= have been able to handle that, no problem. So long as your wheels are rated for 80, or more, you're good to go to run E-rated tires. Obviously, your FW is spec'd for D's if the placard said 65 psi.
Lyle
And where the tires ST tires , then they are calculated in their maximum load for 65m/h and so already a deflection that is to the edges.
If then a little more load or lower pressure and it goes wrong.
What was the history of the tires ,where they always at about 80 psi or did you begin at 65 psi, then a while to low pressure , or better to much deflection , and the damage is done , and slowly this damage leads to a blowout.
The temperature rising from 78 to 86 is what you would expect and does not imply to low pressure. A pressure rising of 10 to 11% is what you would expect to give no damage to tire.
