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Old 03-26-2018, 08:07 AM   #15
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I'm wondering if this is what causes our terrible ride over even the smallest expansion joint. RV came with F range Michelins and I'm running G range Dunlops at 85 psi in the front (using the Goodyear tire chart)
Probably NOT, assuming the tire size is otherwise identical. The higher load range basically just extends the inflation chart to higher load values at higher psi. Where the G overlaps the F in the chart, the inflation pressures should be the same. The slightly stiffer sidewalls make very little difference, usually imperceptible.
However, you also changed brand & tire model, so there may be differences in construction that make the Dunlops stiffer.

Modern tires don't increase the number of plies like in the old days - they just use stronger materials in the sidewalls & belts to get a higher capacity.

Radial ply tires are inherently springy and supple in the sidewalls due to the "radial" direction of the cords that form it. That's why they bulge or squat more than bias-ply construction.
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Old 03-26-2018, 10:25 AM   #16
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Originally Posted by F4Gary View Post
I'm wondering if this is what causes our terrible ride over even the smallest expansion joint. RV came with F range Michelins and I'm running G range Dunlops at 85 psi in the front (using the Goodyear tire chart)
Quote:
Originally Posted by Gary RVRoamer View Post
Probably NOT, assuming the tire size is otherwise identical. The higher load range basically just extends the inflation chart to higher load values at higher psi. Where the G overlaps the F in the chart, the inflation pressures should be the same. The slightly stiffer sidewalls make very little difference, usually imperceptible.
However, you also changed brand & tire model, so there may be differences in construction that make the Dunlops stiffer.

Modern tires don't increase the number of plies like in the old days - they just use stronger materials in the sidewalls & belts to get a higher capacity.

Radial ply tires are inherently springy and supple in the sidewalls due to the "radial" direction of the cords that form it. That's why they bulge or squat more than bias-ply construction.
It's been a few years so i don't remember where i got the information from. I do remember being told that the Sailun tires had 2, or it might have even been 4, more plies than the Michelins they replaced. I'm guessing it was the tire dealer who told me that. Also, to make the tires happy, the minimum i could run was 80 psi. You may be right that neither of these contributed to the harsh ride but by golly,, something certainly did! I suppose being from a different manufacturer could have caused it but i still believe the main reason was because the Sailuns were a heavier duty, higher load range G tire.

I ran the Sailuns for maybe a year and then replaced all the tires with Bridgestones, load range F. In my case, there was a world of difference. The ride is a teensy bit more firm than the Michelins but i'm happy with the decision to get them at half the cost of the Michelins.
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