LT225/75R16 on a 2011 Jayco33rlds

I guess the question is how much safer is safer?

My TT axels are rated to 3500 lbs. each or 1750 lbs. per tire, my OEM ST205/75R15 tires are rated 1820 lbs. load range C. A safety margin of 70 lbs. per tire.

When it comes time to change I will probably go to a slightly larger ST225/75R15 load range C rated 2150 lbs. per tire, providing a safety factor of 400 lbs. per tire. If there is enough clearance for the wider tire I can use the same rims.

I could go to a D rated tire and get a 790 lb. safety factor per tire but where do you draw the line? Heck there are some E rated tire that would darn near allow me to go to a single axle.

I have put 10,000 plus miles on the OEM tire and I bought the rig used. The tires will time out before they wear out and the ST225s are about the same price as the ST205s. I only hope they will ride as smooth.

Check some other brand specs. Not all tire diameters are the same.

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.

Mark,

Keep us posted on what your find out about this tire size swap please. Wondering the same thing about our new 32 BHDS.

May need to take the trailer to your local tire shop and have them do a test fit to see how much clearance you have.

Good luck!!!

Not on a Jayco but on my Sunny Brook it was a fantastic swap and worth every penny. :)