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Old 06-14-2013, 01:03 AM   #1
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I have a new 33BD TTand have a question about the tires. Some other forums claim that trailer tires are speed rated to about 60mph. I have looked at my tires and I do not see any limitation. I normally tow about 60-65 to help with MPG and sway, but occasionally get on a 70mph interstate. Are the tires speed rated? Is 70mph safe for the tires?
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Old 06-14-2013, 01:14 AM   #2
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If they are ST trailer tires I believe they are rated for no more than 65 mph. I switched to LT tires soI no longer worry about that. I still try and drive no more than 65 mph but have gone as high as 70 mph a few times.
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Old 06-14-2013, 05:53 AM   #3
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Me to I switched to lt's My st's road hard and did't make 16,000 miles before they were wore out.
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Old 06-14-2013, 11:46 AM   #4
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ST tires are speed rated at 65 mph. Somewhere on the sidewall it is listed in very small print.
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Old 06-14-2013, 02:20 PM   #5
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Thank you, I will check the sidewalls again. Is ST a speed rating for trailer tires?
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Old 06-14-2013, 07:51 PM   #6
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ST means "Special Trailer". All ST tires have a speed rating of 65 mph.
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Old 06-15-2013, 01:29 PM   #7
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I would add to the debate over the speed rating a caution to not run your ST tires underinflated. If you have a load range D, they should be inflated to 65 psi cold. If you have a load range E, they should be inflated to 80 psi cold. Speed and under inflation are a tires worst enemy.
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Old 06-15-2013, 11:32 PM   #8
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And if you have load range C, which I do, they should be inflated to 50 psi cold.
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Old 06-15-2013, 11:34 PM   #9
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Max air pressure inflation is intended for max load.



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Old 06-16-2013, 02:25 AM   #10
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Quote:
Originally Posted by Old Farmer
Max air pressure inflation is intended for max load.



I agree, I would only inflate to max psi IF I didn't have any idea how much weight each tire needed to actually carry. There is a reason that tire manufacturers publish load inflation tables. Consider the situation that exists with truck tires. My GM door sticker clearly states 80 psi for the rear tires and 50 psi for the front tires. So even though all 4 tires are load range E (80 psi), max psi is not needed since the front axle GAWR is much less than the tire capacity and the front tires would be over inflated at 80 psi. In fact, most owners don't run the rear tires at 80 psi when running solo in order to improve the truck's ride.

Actually, my Cruiser is an even better example. The factory installed ST tires had a capacity of just over 7000 lbs per axle, yet the GAWR is just 5200 lbs. So, running the tires at 80 psi means they are over inflated for any legal trailer weight. Tire flex is one of the components in handling road shock, so over inflated tires means more stress on axles, springs, hangers, eye bolts and the rest of the trailer.
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