LT225/75R16 on a 2011 Jayco33rlds
I posted in another thread my concerns with the ST225/75R15 Goodyear® Marathon Radial on our 2011 Jayco33rlds. I received a lot of good information on different ST tires and some suggestions on upgrad...
Forum Discussion
Jay Flight 33RLDS,
I suggest that it is not the difference between 15" and 16" that gives you added tire capacity so you are not running at close to 100% of your OEM tire's rating at max pressure. Is the difference between "D" range and "E" range rating of max capacity at max pressure. The added 2 extra ply ratings on the "E" tire and allowing an additional 15 psi of inflation.
225/75/15 "D" (8 ply rated) has a max capacity of 2540 lbs at 65 psi per tire. While a 225/75/15 "E" (10 ply rated) has a max capacity of 2830 lbs at 80 psi per tire. + 290 lbs per tire or 1160 for the 4 tires. A 225/75/15 "D" tire at max pressure being at 100% of weight capacity is only at 90% of capacity with a 225/75/15 "E" tire at max pressure and has the same OD as the 225/75/16 tire.
This means you'd be accomplishing your same desire but not having to replace the wheels. Just the tires. This is exactly what I had done on my RV and it works great and so much less heat buildup in the tires which will quickly compromise the tire's structure components and lessen their useful life. Blowouts aren't any fun! I use my infrared temp gauge and saw an average of approx 17 degrees less tire sidewall heat buildup with the "E"s on our trailer in 2 years of constantly checking them each time we'd stop in a rest area etc when traveling. The sun side is usually always 10-15 degrees hotter than the shaded side of an RV so keeping them cooler when traveling the road is very important.
I suggest that it is not the difference between 15" and 16" that gives you added tire capacity so you are not running at close to 100% of your OEM tire's rating at max pressure. Is the difference between "D" range and "E" range rating of max capacity at max pressure. The added 2 extra ply ratings on the "E" tire and allowing an additional 15 psi of inflation.
225/75/15 "D" (8 ply rated) has a max capacity of 2540 lbs at 65 psi per tire. While a 225/75/15 "E" (10 ply rated) has a max capacity of 2830 lbs at 80 psi per tire. + 290 lbs per tire or 1160 for the 4 tires. A 225/75/15 "D" tire at max pressure being at 100% of weight capacity is only at 90% of capacity with a 225/75/15 "E" tire at max pressure and has the same OD as the 225/75/16 tire.
This means you'd be accomplishing your same desire but not having to replace the wheels. Just the tires. This is exactly what I had done on my RV and it works great and so much less heat buildup in the tires which will quickly compromise the tire's structure components and lessen their useful life. Blowouts aren't any fun! I use my infrared temp gauge and saw an average of approx 17 degrees less tire sidewall heat buildup with the "E"s on our trailer in 2 years of constantly checking them each time we'd stop in a rest area etc when traveling. The sun side is usually always 10-15 degrees hotter than the shaded side of an RV so keeping them cooler when traveling the road is very important.
