The S is a higher speed rating, if they are both C 116 they have the same load rating

Thanks, so since same load same psi for both speed ratings Q & S despite the different max PSIs.

About to get a set of 265s mounted sometime next week and finally ditch the original Dunlops. Sounds like the sweet spot to have these inflated to is at 38-40 psi. Thank to everyone for their inputs!

I’m also about to get my KO2’s installed next week (LT265/70/17 C). I’m going to see if America’s Tires can balance my new tires using the road force balancer. I’m also going to have them set the PSI to 40. Since my driving is mostly paved roads, it seems like that’s the way to go.

I run 42psi (E-Rated)

36F/35R on 265/70/17 Load C (112). Stock SR5P, no extra weight.

40 caused excess center tread wear, though that is the recommended pressure to equal the 113 load rating on OEM GrandTreks for max GVW. I'm not worried much about the difference. There is obviously a fair amount of margin as the factory Limited tires have a load rating of 107.

If you have the same load range as OEM then 37psi what worked for me in any weather conditions, snow, rain. if the load range is higher than I would do 45 or 42. My first set was E load and they were to harsh for me, I was able to replace them with factory load range C with 37psi, perfect tires no matter what some people say if you keep them at 37psi you will have the best experience.

my 265's i run around 38 psi for high way driving but go down to 20 for trailing usually. for a more comfortable drive on the streets i could go down to 32 psi, its preference

Those of you guys who are running load E tires what kind of increase in tire psi are you guys seeing after driving. I’m seeing a 7psi increase on my rears which seems a bit high so I increase the psi since I’m thinking my tires are getting a little to warm but same thing. Whether I run 42psi or 45 same outcome.

I'm running an E Rated 285/75/17 and driving around SF I typically see a range from 38-42 from temp changes. I'm in the heart of today's Tahoe storm and it dropped down to 36.

Yah that’s what I’m usually used to (4 psi) fluctuation 7psi just seems much. Yah stay dry I’m in SoCal so this rain is much needed for us.


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What I don't understand is this. The limited with 20" wheels comes with P245/60r20 @ 32 PSI. The load rating is 107 and at 32 PSI this equates to 1973 lbs, much lower than the other trims with 265/70r17.

Then subtract 10% to convert to an "LT" rating and that comes out to 1794 lbs.

Looking at the inflation table below for a LT265/70R17, 35 psi gives a load rating of 1890 lbs, which exceeds the Limited's stock tire load rating at the suggested inflation pressure.

https://www.toyotires.ca/sites/defau...s_20170203.pdf

Does the limited have a significantly lower payload rating than an SR5/TRD Off Road or TRD Pro?

If it does not, it means that the payload rating limitation does not come from the tires, it comes from the chassis/suspension/stability control tuning dynamics and you can safely run an LT 265/70R17 at 35 psi up to the 4Runner's maximum payload rating. Toyota therefore recommends 32 PSI on the 265/70r17 tires not for payload capacity but rather to maximize fuel economy.

Unless I'm completely lost

You need to look at the load chart for the specific tire. My original P dunlops were rated at 2425lbs at 32psi, then derated to 2204lbs being on the light truck (4runner). Cross that over to the TAKO2's LT chart, and 44psi makes sense, 45psi would be 2255lbs.

Yes I understand that, the load chart for the oem limited 20” tire at 32 psi indicates a much lower load rating than the 265/70/17 equipped on the sr5/TRDOR/trdp.

What doesn’t make sense is that the owner of a limited t4r installing k02s will inflate them at 35 psi to match the OE 20” tire load rating, and the owner of an SR5/TRDOR/TRDP will inflate them at 44 psi to match the OE 17” tire load rating, yet as far as I know all t4rs have quite similar vehicle towing and payload capacities (the exact numbers are in my previous post).

It seems like the 265/70/17 oe tire was designed for larger vehicles with higher tire load rating requirements that far exceed those of the 4runner. Toyota would have kept the “overkill” inflation of 32 psi on the 17” tires for the sake of fuel economy, rather than out of necessity to achieve the tire’s specific load rating at that pressure.

At the end of the day, my point is that it appears that one could safely run LT265/70/17 k02s (or any other LT265/70/17) at 35 PSI as long as they don’t exceed the t4rs overall payload capacity, since the tire’s load rating exceeds the limited’s 20” tire load rating.

Sorry for the n00b question but did any of those who got the 265/70/17 C rated had any problems?
Just got a new '21 Off Road with KDSS and I'm considering getting the 265, but I see that the load index is lower than the stock (112 vs 113) and wondered if this could cause any issue