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Old 07-12-2015, 10:48 PM   #1
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Tire speed rating shocker!!

Hey everyone, I was browsing camping stuff and got sidetracked a bit into tire info. I have the new Carlisle RH tires, and I religiously check my PSI and keep it to 65 mph max. Slumming in another forum, the discussion turned to top speed which led me to check my tires and then the Carlisle website. I was shocked. My ST225/75R15 LRD tires have a "N" speed rating... the "N" indicating a max speed of 87MPH!!

Now, I am not advocating anything here--or wanting to start arguments--as well as this isn't going to change my driving habits, but your thoughts on this???

The Carlstar Group

and my tire....
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Old 07-13-2015, 01:09 AM   #2
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The speed rating for your ST tires simply means the tire can carry it's maximum load capacity up to and including the tire manufactures limit for that tire. Of course that doesn't mean for the owner to exceed any posted speed limits.

St tires without any speed markings on their sidewalls are limited to 65 MPH.
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Old 07-13-2015, 02:28 AM   #3
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2535 Pounds and up to 87mph
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Old 07-13-2015, 01:30 PM   #4
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I found it odd because all the threads on ST tires were very specific on the 65mph max. Some touched on adding psi to gain a higher speed. But this is all welcome news to me, as I always winced if I topped over the Ol' 65mph limit going downhill. I can breath easier now
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Old 07-13-2015, 01:46 PM   #5
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I have Double King DK688 ST235/80/R16 with a load/speed rating of 123Q, which is 3520lbs and 99 mph. Luckily I normally travel towing about 65 - 68 mph, with periods, while passing, at mid 70's. Nice to know the tire has a rating of 99 mph although I never plan to travel that fast.
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Old 07-13-2015, 02:25 PM   #6
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IMO once one of the major ST tire manufacturers raised the bar the others will follow. For the off shore - mainly China - tire manufacturers to continue getting sizeable tariff relief from the USA they must include a speed rating on each ST tire's sidewall.
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