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Old 08-09-2015, 09:58 PM   #1
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Tire Speed Rating

I keep seeing comments about trailer tires rated at 70 MPH max. Does any one know where this is written or posted? I have looked at my tires and documentation and cant find anything on the subject.
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Old 08-10-2015, 09:18 AM   #2
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According to Discount Tire, Carlisle has a speed rating of L, which is up to 70 MPH. Most other brands show N/A. Through some research, I know that Goodyear Marathons have a max speed rating of 65 MPH.
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Old 08-10-2015, 09:25 AM   #3
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I have Double King tires that have a speed rating up to 99 mph. Do not plan to ever pull at that speed though.
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Old 08-10-2015, 09:53 AM   #4
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Actually the industry standard for ST trailer tires is 65MPH. Some brands are rated for higher speeds. See Here for an overview.
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Old 08-10-2015, 10:54 AM   #5
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Quote:
Originally Posted by honker View Post
I have Double King tires that have a speed rating up to 99 mph. Do not plan to ever pull at that speed though.
Are those trailer tires? Hard to imagine any ST tire rated up to 99 MPH.
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Old 08-10-2015, 11:14 AM   #6
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Double King DK688 ST235/80R16. Had some specs, can't find them now. Will look.
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Old 08-10-2015, 11:15 AM   #7
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load speed rating of 123Q which I believe is 3520lbs load and 99mph speed
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Old 08-10-2015, 11:42 AM   #8
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Here's what I found on Westlake tires that FR put on my 5er.





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STZC Trailer Tires
Mobile House Tires
Model:STZC Class:Trailer Tires Highlights:
  • Double steel belts for enhanced strength helping puncture resistance and vehicle towing stability
  • Long life and low rolling resistance compound to offer long original treadwear and to promote fuel economy
  • Full nylon cap available in all sizes for improved uniformity and durability
Description: N/A Size Ply Rate Tread Depth Load Index & Speed Rating Std. Rim Section Width Overall Diameter Max. Load Single Max. Load Dual Max. Load Max. Pressure mm 32nd mm inch mm inch kg lbs kg lbs kg lbs kpa psi ST175/80R13 6 7.5 9.5 91 5.00J 177 6.97 610 24.02 - - 615 1356 1360 2998 350 51 ST185/80R13 8 - - 99/95 5.00J 184 7.24 626 24.65 - - 775 1709 690 1521 450 65 ST205/75R14 6 7.8 10.0 100 5.50J 203 7.99 664 26.14 - - 800 1764 1760 3880 350 51 ST215/75R14 6 7.5 9.5 102 6.00J 216 8.50 678 26.69 850 1874 1870 4123 350 51 ST205/75R15 6 7.8 10.0 101 5.50J 203 7.99 689 27.13 825 1819 1820 4012 350 51 ST205/75R15 8 7.8 10.0 107 5.50J 203 7.99 689 27.13 975 2150 2150 4740 450 65 ST225/75R15 6 8.2 10.3 107 6.00J 223 8.78 719 28.31 975 2150 2150 4740 350 51 ST225/75R15 8 8.2 10.3 113 6.00J 223 8.78 719 28.31 1150 2540 2535 5600 450 65 ST225/75R15 10 - - 117 6.00J 223 8.78 719 28.31 1285 2833 2830 6239 550 80 ST235/80R16 10 8.2 10.3 123 6.50 235 9.25 782 30.79 1600 3520 3527 7760 550 80
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Old 08-10-2015, 03:40 PM   #9
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Mine are rated 65 mph, don't go over 60. Where are you going in such a hurry. I pull with a 1/12 5 pick-up and see big boys pass me and up the road, their down with a flat. Slow down, life is short, and tires last longer.
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Old 08-10-2015, 03:59 PM   #10
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65 mph is a tire industry standard published in the Tire & Rim Association yearbook.

The letter grade speed rating are based on passenger car tire test specified by SAE.

Despite some tires showing faster speed ratings most major tire companies place a operating speed limit of 75 mph in RV application unless the tire is rated lower (such as 62 for certain size tires) or a max of 65 for tires with no speed symbol molded on the tire sidewall.

I note that the heavy trucking industry is seeing an increase in tire failure rate in locations where the highway speed limit has been raised above 70 mph.
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