Sailun 637

JTrac wrote:

CapriRacer wrote:

JTrac wrote:
I've been thinking about changing to a heavier duty tire and I'm considering the Sailun's. My problem is I'm not sure if the wheels on my Pinnacle have the capacity for heavier duty trailer tires. It came with 255/85/r16 Goodyear Endurance. Neither Jayco or Tredit Tire and Wheel, their supplier, could tell me exactly what I have. The wheels are 8 lug and the outside width appears to be about 8 inches. Sailun says their 235/85/r16 S637 needs a rim width of 6.5 inches. Other brands give an acceptable range of rim widths but not Sailun. I would hate to order a set and find they wouldn't work with my wheels. No information is stamped on the outside of the wheels.

Tire engineer here.

Wheels: The best information I have been able to gather is that not only does the government not require a max pressure to be written on wheels, but that wheel manufacturers only consider the max load to be important. I take that to mean that stresses in wheel due to pressure are much smaller than stresses due to the load. As confirmation, I note that when people purpose try to fail a tire by inflating it, the wheel isn't what fails.

Allowable rim width range: It's size dependent, not dependent on the manufacturer (brand). That's because there are tire standardizing organizations and they are the ones who set the range - with the agreement of the tire manufacturers. If you see a spec for one brand, it will be the same if another brand doesn't state otherwise.

Thank you. I have a friend who has a couple of tire shops in our town. I'm going to take a wheel to him and he is going to break it down and see exactly what I have. I'm pretty sure I have a 7 inch wide rim rated by the manufacturer for 110 psi and 4400 pound load capacity. This would match the Sailun's and several other tires I'm considering if that is the case. My total weight for the fifth wheel loaded for a month long trip to the Colorado Rockies is 14,700. My hitch weight is 3120 leaving 11,580 on the axles. I know getting the heavier tires would be overkill and I would have to adjust the inflation accordingly but I have always been one to err on the side of safety.