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Old 08-18-2020, 06:12 PM #1
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are you staying true to tire speed ratings?

currently shopping for a 33" set of KO2s, it looks like tirerack has two options in the C load range, a Q (99mph) and an S (112mph) rated tire. Stock 4runner tires are S rated and this somewhat aligns with the 4runners factory top speed (115mph).

usually i would just go with the S rated tire, but it's 7 pounds heavier than the Q rated one and i also have no intention of ever breaking 100mph in this vehicle. i wouldn't mind keeping that weight off the vehicle.

would i be rolling the dice if i went with the lower top speed rated tire and stayed under it's speed rating?
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Old 08-18-2020, 06:23 PM #2
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If you are going over 99 mph regularly then go with T or higher rated tire
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Old 08-18-2020, 06:24 PM #3
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I think you should accept a lower top speed with larger tires.
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Old 08-18-2020, 06:27 PM #4
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This thing wasn't meant to go much faster than 90mph.
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Old 08-18-2020, 06:29 PM #5
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Quote:
Originally Posted by LandCruiser View Post
This thing wasn't meant to go much faster than 90mph.
What type of tire are u talking about

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Old 08-18-2020, 06:43 PM #6
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Any states where the speed limit is 99+?

Speed ratings on tires mated to the top speed of the car are mandated because some idiot will drive for an extended period at high speeds and blow up a tire.

There is nothing to preclude you from using a tire with a lower rating. Snow/winter tires in Europe come with a sticker for your dash showing the top speed of the tire. It is mandated to affix the sticker if the rating of the tire is below the rating of the car.
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Old 08-18-2020, 06:51 PM #7
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Quote:
Originally Posted by davewaner41 View Post
What type of tire are u talking about

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The 4Runner.

It doesn't stop or change direction well enough to go above 90mph.
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Old 08-18-2020, 07:04 PM #8
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Quote:
Originally Posted by LandCruiser View Post
The 4Runner.

It doesn't stop or change direction well enough to go above 90mph.
Yep. Tire speed ratings on these cars is really immaterial - actually, speed ratings in the US are mostly immaterial.
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Old 08-18-2020, 07:06 PM #9
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i guess the question i'm asking is


between the Q and S rated version of the 285/70/17 KO2, there's for sure a difference in construction, about 7 pounds worth according to Tire Rack.


do you guys think this difference in construction would be noticed in the scope that most of us use our 4runners for (highway driving under 90mph and occasional trail use/overlanding)?
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Old 08-18-2020, 07:23 PM #10
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It all depends on how you drive your vehicle.
I drive the legal, posted speed limit. I also live a couple miles down dirt roads. Some local roads require 4wd.
So I look for robust construction which means heavier tire.
If I lived in a city, or a town, I'd maybe look at a different tire better suited to that type of driving.
So the answer is, "it depends".

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Old 08-18-2020, 07:24 PM #11
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Quote:
Originally Posted by usdmej View Post
i guess the question i'm asking is





between the Q and S rated version of the 285/70/17 KO2, there's for sure a difference in construction, about 7 pounds worth according to Tire Rack.





do you guys think this difference in construction would be noticed in the scope that most of us use our 4runners for (highway driving under 90mph and occasional trail use/overlanding)?
I have had 2 sets of 285/70/17 KO2's that were Q rated and have a 3rd set on now. I know at least 2 dozen other people personally that have those same tires also Q rated. These people range from grocery getter daily drivers, to gravel road drivers, to overlanding in the backcountry. You will be fine with the construction of the tires and that Q rating wont make a bit of difference to you.

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Old 08-19-2020, 01:16 PM #12
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Quote:
Originally Posted by 4runnin4mylife View Post
I have had 2 sets of 285/70/17 KO2's that were Q rated and have a 3rd set on now. I know at least 2 dozen other people personally that have those same tires also Q rated.
very much appreciate your experience!

i assume the S rated tires are stiffer to handle the higher speed they're rated at, whether or not that translates to durability on a trail is what has me agonizing over at the moment. i'll probably just go with the q rated tires
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Old 08-19-2020, 01:44 PM #13
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Quote:
Originally Posted by LandCruiser View Post
This thing wasn't meant to go much faster than 90mph.
That's very true. I've done 90mph in my 4R a handful of times to pass on long highway stretches where the speed limit is 80mph and it does not like that speed very much at all. Engine is revving high, feels like it's getting blown around in wind, and is very top heavy. Again I've only done it a few times to pass a 18 wheeler and I would never recommend doing that on a regular basis. Usually I'm at 70-75mph and it's much more comfortable at that speed range.
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Old 08-19-2020, 02:25 PM #14
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i guess the question i'm asking is between the Q and S rated version of the 285/70/17 KO2, there's for sure a difference in construction, about 7 pounds worth according to Tire Rack.


do you guys think this difference in construction would be noticed in the scope that most of us use our 4runners for (highway driving under 90mph and occasional trail use/overlanding)?
Any KO2 is going to be fine for what you describe. All of the KO2 series are made to go off-road and both of those have the same C load range. If you lived in SD or WY and constantly drove at 85mph or more then I would consider the extra margin offered by the S-rated tire.
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Old 08-19-2020, 02:35 PM #15
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Quote:
Originally Posted by sn_85 View Post
That's very true. I've done 90mph in my 4R a handful of times to pass on long highway stretches where the speed limit is 80mph and it does not like that speed very much at all. Engine is revving high, feels like it's getting blown around in wind, and is very top heavy. Again I've only done it a few times to pass a 18 wheeler and I would never recommend doing that on a regular basis. Usually I'm at 70-75mph and it's much more comfortable at that speed range.
When I drove my '10 TE out west a couple of years ago, I hit South Dakota where the speed limit was 80 and minimal truck, or really any traffic. I did 90 almost all the way across the state and the 4Runner did fine. I think my gas mileage dropped to about 16.5 but it was solid. There were a couple of quail that hit the windshield and made pretty some pretty loud thumps. Another one hit the fog light surround and its whole body was wedged in between the fog light and the bumper with just its feet sticking out. That was a mess to dig out.

My '20 on the other hand doesn't seem to want to go that fast... more of a struggle. And it seems to feel looser at that speed. I think I will have to add the Bilstein 5100s and get a better alignment to approach my old 4Runner's stability.
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