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Old 04-21-2016, 10:02 AM   #11
clr
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Well when I run the numbers here as a double check for you. The GY 235 80R16 tire has a diameter of 30.7 inches, the Sailun 215 75R17.5 has a diameter of 30.4 inches and the 235 75R17.5 has a diameter of 31.6. So you have a distance between the tires now of 2.3 inches. If you go with the 235 75R17.5 tires you will have a distance between the tires of 1.4 inches just above the minimum of 1 inch. The GY 16 inch tire has a section width of 9.2 inches the Sailun 215 has a section width of 8.1 inches and the 235 has a section width of 8.9. So you are within the min for the axles but the final call here is up to you of course. In my case the local type tire guys were of little to no help most tried to blow smoke in order to sell what they had in stock.

By the way I paid 1,561.85 for the 5 wheels and tires mounted from the Tredit tires folks with no shipping included.
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Old 04-21-2016, 10:24 AM   #12
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I think I am going to go with the 235 75 17.5 Sailun tires, the numbers seem to work. I am just looking for some real world experience before I spend the money. I appreciate all the feed back.
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Old 04-21-2016, 12:25 PM   #13
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I think I am going to go with the 235 75 17.5 Sailun tires, the numbers seem to work. I am just looking for some real world experience before I spend the money. I appreciate all the feed back.
If you haven't done so you should touch base with your trailer's manufacturer. They will most likely give you a standard "canned answer" about the tires.

Your trailer is still under factory warranty. Ask them if radical tire changes in size and load range is going to cause any warranty coverage losses in the suspension and vehicle framing.
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Old 04-21-2016, 02:57 PM   #14
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I had 235/80/16's with 2 inches between them and while I wasn't making the jump to 17.5's I initially was going to do the 235/85/ Sailun S637's and just have 1 inch between tires. Luckily I found the 235/80 Sailun's and went that route in the 16" tire and kept the same spacing. They have 4080 capacity and I couldn't justify the cost of wheels and tires in 17.5" to gain 800lbs of capacity per tire.
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Old 04-21-2016, 03:18 PM   #15
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Sure hope that you checked out the existing wheels to ensure that they were able to handle the increased weight rating and the higher air pressure required. In my case the existing wheels were only rated to 3580# and not rated for any air pressure above 80 PSI. This is why I changed the wheels also. So the wheel was acceptable only up to load range E and not above that.
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Old 04-21-2016, 05:35 PM   #16
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I looked into just changing the tire but the rims are only rated for 80PSI, that is why I was looking at the 17.5 tires. I figure that if I have to change the rims to go to a higher pressure 16 inch tire why not go to the 17.5 for a few extra bucks. The 235 75 17.5 is actual smaller than the 235 85 16. I have 6 inches above the tire to the trailer for bump clearance so that should not be an issue. The numbers say that I am good and I have not heard anyone say that they have first hand knowledge otherwise. Just wanted to check before I spent the money.
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Old 04-21-2016, 07:53 PM   #17
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The sailun tire is 235 75 R17.5 has a diameter of 31.6 inch. The GY Marathon 235 80 R16 tire has a diameter of 30.7 inches. So the 235 75 R17.5 is larger than the 16 inch tire by only .9 inch not much at all but it is larger.
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Old 04-22-2016, 08:54 AM   #18
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Yes it will leave me 1.4 inches between the tires, the axles are 33 inches on center.
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Old 04-22-2016, 09:24 AM   #19
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I looked into just changing the tire but the rims are only rated for 80PSI, that is why I was looking at the 17.5 tires. I figure that if I have to change the rims to go to a higher pressure 16 inch tire why not go to the 17.5 for a few extra bucks. The 235 75 17.5 is actual smaller than the 235 85 16. I have 6 inches above the tire to the trailer for bump clearance so that should not be an issue. The numbers say that I am good and I have not heard anyone say that they have first hand knowledge otherwise. Just wanted to check before I spent the money.
If I had to do rims in addition to new tires I likely would have gone the 17.5 route. I was lucky that my existing rims would accommodate the 110 PSI for the Sailun's
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