Toyo Open County AT III (AT3) - Page 9 - Toyota 4Runner Forum

Stabbi · 01-06-2021, 03:57 PM

Quote:

Originally Posted by Espresso_OI

Out of curiosity - but for those running the ATIIIs, what tire pressure are you running (on the road) ?

new AT3s installed last week, 265/70/R17 SL at 38PSI. Ride has been excellent, but I was coming from some bad Nitto TG (originals) so... MPG appears to be slightly higher, but haven't really driven enough yet to confirm any change.

MIKE969 · 01-06-2021, 07:31 PM

Quote:

Originally Posted by Stabbi

new AT3s installed last week, 265/70/R17 SL at 38PSI. Ride has been excellent, but I was coming from some bad Nitto TG (originals) so... MPG appears to be slightly higher, but haven't really driven enough yet to confirm any change.

Why are you running SL tires at 38psi? They should be at 32 cold.

NorthPark · 01-10-2021, 05:26 PM

Add me to +1 side wall gouge, didn't fail but I guess I'll be ordering a replacement tomorrow. 2k miles on them

10ply e-load 285s

Stabbi · 01-10-2021, 07:18 PM

Quote:

Originally Posted by MIKE969

Why are you running SL tires at 38psi? They should be at 32 cold.

They aired them to 38psi from Discount tire when they installed them, so just left it at that for now. I drove on them about 300 miles this week/weekend all highway. 38psi seems fine to me. Now, keep in mind when they aired them to 38 psi, it was about 50 degrees out. This week we are in the 20s at night...mid 30s in the day time, so not concerned about 38psi.

MPG is the same so far.

janoslc · 01-16-2021, 03:33 PM

Any comparison of these tires to nitto ridge grappler ?
Want to try P metric

Now i am running ko2 load E
Too stiff and heavy 60 lbs each

Enviado desde mi iPhone utilizando Tapatalk Pro

5thToy · 01-16-2021, 06:14 PM

Quote:

Originally Posted by Stabbi

They aired them to 38psi from Discount tire when they installed them, so just left it at that for now. I drove on them about 300 miles this week/weekend all highway. 38psi seems fine to me. Now, keep in mind when they aired them to 38 psi, it was about 50 degrees out. This week we are in the 20s at night...mid 30s in the day time, so not concerned about 38psi.

MPG is the same so far.

The concern over time would be uneven center wear. It would be interesting to do a chalk test to see if you are getting a full contact patch.

MIKE969 · 01-16-2021, 06:15 PM

Quote:

Originally Posted by Stabbi

They aired them to 38psi from Discount tire when they installed them, so just left it at that for now. I drove on them about 300 miles this week/weekend all highway. 38psi seems fine to me. Now, keep in mind when they aired them to 38 psi, it was about 50 degrees out. This week we are in the 20s at night...mid 30s in the day time, so not concerned about 38psi.

MPG is the same so far.

38 PSI cold is likely too high and will result in premature and uneven wear down the center line of the tread.

Having worked in the service department of a dealership I can guarantee you that most tire guys don’t know jack shit about tire inflation pressures. It should be 32-33 PSI.

This is from Toyo’s site but applies to any brand:

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

honda250xtitan · 01-17-2021, 10:01 AM

Quote:

Originally Posted by janoslc

Any comparison of these tires to nitto ridge grappler ?
Want to try P metric

Now i am running ko2 load E
Too stiff and heavy 60 lbs each

Enviado desde mi iPhone utilizando Tapatalk Pro

they'll be quieter. also from E to P load its gonna get way softer which sounds like what youre after.

Stabbi · 01-17-2021, 09:53 PM

Quote:

Originally Posted by 5thToy

The concern over time would be uneven center wear. It would be interesting to do a chalk test to see if you are getting a full contact patch.

Yeah, I agree, I lowered them to 34lbs the other day. I may lower again to 32lb after some driving.

flyguy303 · 01-21-2021, 03:30 PM

Just put a set of 285 70 17 C load on my rig and so far they are great. Tracks REALLY straight and smooth, feels quieter than my old ko2s, and the C load seems to be a plusher ride. They look great, while not quite as aggressive with the sidewalls as the ko2s, I don't think they are lacking at all. Will update when they have seen snow, should get some next week.

Imgur: The magic of the Internet for pictures

d1nguyen · 01-21-2021, 03:38 PM

Any reason hey C and E loads has different speed ratings? C Load shows Q speed rating and E Load shows S speed rating.

5thToy · 01-21-2021, 04:27 PM

Quote:

Originally Posted by d1nguyen

Any reason hey C and E loads has different speed ratings? C Load shows Q speed rating and E Load shows S speed rating.

I'm guessing, but I would think more mass and higher density equates to reduced ability to dissipate heat.

SilverTEP · 02-19-2021, 10:21 PM

Quick review of AT3s coming from E rated KO2s. I got Toyos in 285/70/17 C rated, they are as quiet and comfortable as KO2s. They are amazing in the rain, much much better than KO2s, zero hydroplaning, great stopping power, super confident in the rain with these.

KO2s were better in the snow, they seemed to grip better, but not by a wide margin. On pure rock it's hard to tell still, need few more trips, so far they seemed on par.

The sidewalls look great, and the rain performance makes them worth it for me, snow trips are just for fun for me.. but we get plenty of rain, and KO2s were sketchy on freeway off ramps and needing to stop really quick.

sawman1 · 02-22-2021, 03:32 PM

Quote:

Originally Posted by SilverTEP

Quick review of AT3s coming from E rated KO2s. I got Toyos in 285/70/17 C rated, they are as quiet and comfortable as KO2s. They are amazing in the rain, much much better than KO2s, zero hydroplaning, great stopping power, super confident in the rain with these.

KO2s were better in the snow, they seemed to grip better, but not by a wide margin. On pure rock it's hard to tell still, need few more trips, so far they seemed on par.

The sidewalls look great, and the rain performance makes them worth it for me, snow trips are just for fun for me.. but we get plenty of rain, and KO2s were sketchy on freeway off ramps and needing to stop really quick.

Agree with above.
I did a lot of research before changing out to Toyos. I ran 275/70/17 BFG KO2's for 16k miles on my Limited, and just swapped out here recently to 285/70/17 Toyo AT3s. They are P-rated, and I am SO much happier with them from a ride standpoint. I think the 275 E rated was overkill for my use - for me, they rode awful on a 4R and performed poorly/unpredictable in wet weather. Made the move for 1) Wet weather capability, 2) Ride quality and 3) A little larger. BFGs did kill it in the snow, I expect similar from the Toyos.

SilverTEP · 02-22-2021, 10:44 PM

Awesome, had same 275/70 KO2s rated E because I didn't want to deal with rubbing and chopping the mount.. Felt so heavy, but were bulletproof on the trail esp sharp rocks. I finally got the chop and went with the AT3s at 285/70 rated C and now i have room to push my tires out for that instagram look lol.

KO2s killed it in the snow for me, didn't even had to air down, and had more grip in the snow then cars with bigger MTs. AT3s need to be air down to like 20PSI and then they are fine, obviously much better than stocks no matter what. I'm guessing similar would be in loose sand, since i think KO2s are made for that.

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