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TECH SPECIALIST
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Mazama Open range review... These are a 285-75-17 tire, 10 ply tread 2 ply sidewall <--

Day 1: Out of the alignment shop, tons of drag, so much so I thought the brakes were dragging. Coasting down hills was rough, a lot of speed lost. High rolling resistance. Lots of squirm.

Day 4: Rolling resistance dropping, mpg trying to make a comeback (was extremely bad for 300~350 miles, 426 miles on it now and it has improved). squirm continues, probably has to do with the 2 ply sidewall








10/13/2018, 400.8 miles, 17.870 gal, 22.428 mpg Toyo Open Country 2's at 110k miles

10/18/2018, 535.1 miles, 25.471 gal, 21.008 mpg Mazama Open Range ATs at 535 miles... A lot of drag for first 300~350 miles, coasting down hill was a joke, most of it has come back now and would estimate its 90~95% of what it was with the Toyos.

11/10/2018, tires swapped... mpg numbers here...
https://www.cumminsforum.com/forum/tire-wheel-3rd-gen/2481195-mazama-open-range-tire-review-3.html#post28789783
 

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Taking a hard look at these. Anyone else?

Les Scwab guys say these are the best truck tire they have, even better then the ATII.
 
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TECH SPECIALIST
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I dont recommend a 75 series tire... Too much sidewall flex. I am either going to go back to the toyo in this size or this tire in the 70 series... If your anywhere in the tacoma area and want to do a meet & greet your welcome to go for a spin with me and see what i see...
 

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Bailing on these tires... had some 30ish mph winds and truck felt like driving on springs... think bobble head motion..

These tires are probably fine on a lighter truck. OR in a 70 series tire.

Going back to the tried & true Toyo Open Country 2 in the 285-70-17 size.
 

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I purchased these in 35x12.5x20 and I’m very happy with them so far. I have put 500 miles on and I’m amazed at how quiet they are, especially compared to the Nitto EXO Grapplers (for sale by the way), Inran last winter. The highway ride is very good and predictable and around town very good.

I took them on a fire service road that has a good mix of rocky surface and dirt with a lot of wash board. They were great, nothing extreme, but they had a really solid grip.

I see some snow in the mountains and I’m curious as to how these will do. They have the three peak rating, so I doubt I’ll be disappointed.

As for appearance, they have a good look to them. Aggressive and solid looking.

I’m not having any issues with side wall flex and would recommend buying these tires.
 

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Discussion Starter #8
your paragraph states 285-75-17 yet the picture showed 285-70-17....
Those tires did not go on.. my son sent me that pic when he first got them in his shop, I posted it to show the tread...
 

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I purchased these in 35x12.5x20 and I’m very happy with them so far. I have put 500 miles on and I’m amazed at how quiet they are, especially compared to the Nitto EXO Grapplers (for sale by the way), Inran last winter. The highway ride is very good and predictable and around town very good.

I took them on a fire service road that has a good mix of rocky surface and dirt with a lot of wash board. They were great, nothing extreme, but they had a really solid grip.

I see some snow in the mountains and I’m curious as to how these will do. They have the three peak rating, so I doubt I’ll be disappointed.

As for appearance, they have a good look to them. Aggressive and solid looking.

I’m not having any issues with side wall flex and would recommend buying these tires.
With the low profile of those tires you have, I'd expect no problems. I may give the 70 series a shot next time around if they offer the limited test time.

Please feel free to give some feedback here (or your own thread) when you get them in the white stuff. I'm still curious as to how they would perform under those conditions.
 

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I purchased these in 35x12.5x20 and I’m very happy with them so far. I have put 500 miles on and I’m amazed at how quiet they are, especially compared to the Nitto EXO Grapplers (for sale by the way), Inran last winter. The highway ride is very good and predictable and around town very good.

I took them on a fire service road that has a good mix of rocky surface and dirt with a lot of wash board. They were great, nothing extreme, but they had a really solid grip.

I see some snow in the mountains and I’m curious as to how these will do. They have the three peak rating, so I doubt I’ll be disappointed.

As for appearance, they have a good look to them. Aggressive and solid looking.

I’m not having any issues with side wall flex and would recommend buying these tires.
My Exo's were too noisy for my taste. Sold them and got some Toyo AT2's. The Toyo MT's I had a ways back were the most stable tire I've run too date.
 

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Discussion Starter #11
My Exo's were too noisy for my taste. Sold them and got some Toyo AT2's. The Toyo MT's I had a ways back were the most stable tire I've run too date.
Re: MTs... What do you mean stable ?
 

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Agree with the EXO’s road noise. I was surprised because some reviews on the TDR specifically stated how quiet they were. Otherwise, I really liked them and would have put them back on had they been a larger size.
 

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Bailing on these tires... had some 30ish mph winds and truck felt like driving on springs... think bobble head motion..

These tires are probably fine on a lighter truck. OR in a 70 series tire.

Going back to the tried & true Toyo Open Country 2 in the 285-70-17 size.
This is good to hear, the guy at Les Shwab told me that they were the best also, I think I will just go with the Toyo's Open Country II man I hate these stock tires.
 

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Discussion Starter #15

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Discussion Starter #16
Q​
This is good to hear, the guy at Les Shwab told me that they were the best also, I think I will just go with the Toyo's Open Country II man I hate these stock tires.
They offer a 60 day test drive on them, if your getting a 75 series tire you will probably have the same issue i see, 70, 65 etc probably not. This tire has an 11.5 tread width, a 12.5 wide version may be different.

Try them, put 2000+ miles on them and report back...

Also for what its worth, all new steering linkage, carli stabilizer, ~35k on oem control arms, danatrac ball joints and 200k or so on red head steering box. With the exception of the squirm, drives awesome.
 

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I have been looking at the Open Country A/T2 I think that this will be my next tire, these stock start to break away even when I start off slow I have little over 21,000 miles on these stock.
 

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Still pretty happy with these tires, though I have noticed that they seem to pick up and hold a lot of rocks in the tread. Not a fan of hearing a rock being ejected at highway speeds!
 
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Still pretty happy with these tires, though I have noticed that they seem to pick up and hold a lot of rocks in the tread. Not a fan of hearing a rock being ejected at highway speeds!
Awesome, are you talking about the Open Country a/t 2's or the Open Range?

Sent from my SM-J327VPP using Tapatalk
 

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I have Open Range tires on my truck. They are LT285 70R 17 and I love them! They are the smoothest riding tire I’ve ever had on this truck! I’ve got about 2,000 miles on them now. I did not experience any of the coasting issues.
 
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