Ok all heres what I got back from Al @ Sailun. What great service for them to respond so quickly. I can forward the email to anyone who would like a copy.
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Colin, thanks for being a Sailun customer. You have made a good choice in tires for your RV. Our engineering information only shows maximum inflation for the maximum load. I have attached a chart below that represents the Load and Inflation information from the Tire and Rim Association (Industry Standard). I would suggest you scale your trailer fully loaded – with clothes, food, water, gray water, propane, bikes and…maybe even some beer! Whatever adds up to the maximum weight. Divide that weight by the number of tires to get your load per tire.
You can then use the chart below to find that load for your tire size. The ST235/80R16 only shows up to an 8 ply (D) tire. If you go to the bottom section, you will find the LT235/85R16 which goes up to a 14 ply (G). The load carrying for the 235/80 and the 235/85 are very close. Find the load you calculated (use the row designated with the “S”) and then slide up to the pressure at the top. I would suggest you build 10-15 psi of safety into the pressure you use. The speed rating for your tire is 75 mph. I assume you are not going 75 while pulling your trailer so there is some safety built in by going slower also. The risk in over-inflating is potential irregular wear and trailer bounce. If you use a safety of 15 psi and get some bounce, you can deflate by 5 psi. You will find the sweet spot by experimenting a bit.
Check your pressure before each trip with an accurate tire gauge.
If you have any additional questions, send away.
Safe Travels.
Al Eagleson ‘ACE’
Director, Commercial Truck Products
Sailun-logo-truck
Off 905-595-5558 x671
Cel 416-315-9391
www.sailuntires.ca
