Originally Posted by rp709
The Conti's look like a nice tire. I decided not to loose the .6 inch of ground clearance with a 225/70/15. My dealer obtained Maxxis 225/75/15 E load range tires. I have gone with these. The Maxxis website shows the load rating at different tire inflation pressures. I'll go with 60-65 Psi max on my 7200# gross Safari which will give me a D load rating, which is what Airstream outfitted the trailer with. I replace 8 year old Goodyear Marathon D rated tires. I always inflated them to 60 psi I they have been flawless. I did notice they were made in Canada. All the bad luck out there with GYM tires convinced me to give something else a try. But, they were great for me. Anyway, an E load rated tire is stronger and I hope this continues the good luck I have had.
A couple of thoughts:
The 225/70R15 Load Range D should NOT be a replacement for an ST225/75R15 (except for the Load Range C). That's the wrong direction for load carrying capacity. The 225/70R15 Load Range D CAN be a replacement for ST205/75R15 provided there is enough room under the fenders.
Second, given that there have been many reports of tire failures with 15" tires, my standard recommendation is to go UP
in load carrying capacity. That means if your trailer came with Load Range D, go with Load Range E (and use the higher pressure). I think it is wishful thinking that using a Load Range E tire and inflating it to Load Range D pressures is somehow better.