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Replacing AT tires w/ after market

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1: your ridge grapplers have a lower speed rating than the pirellis or others. Keep an eye out.

2: as others have mentioned, there’s a big segment for these tires - also stuff from BFG, General, Firestone, Bridgestone, etc. I’m planning to swap the pirellis for the Dueler A/T Revo 3 in this size, but I have other reasons for staying brand loyal.
How did you find the speed rating on the RIdge Grapplers? I'm looking on their website but do not see any specs related to speed rating.
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In your table, the “Q” at the end of the size designation indicates a Q rating - 99mph.
 

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Hes right and here's the further scoop. LT tires are inflated to a psi to match the load capacity. So the door card psi is USUALLY irrelevant when you go from euro metric (oem) to LT. But it just so happens that 46-8 is the correct psi to match the trucks load capacity. I have a post on it somewhere here with more details and will try to find. The beauty if LT tires is you can inflate them up for range improvements IF YOU WISH. Ride quality and performance may suck bit it's an option. I run my lt tires at 48 for everyday use and air them up to 60 for road trips in good weather conditions.
Recognizing your analysis here (I did not know this about LT tires, but I try to stay away from our core business as much as possible!), wouldn't higher pressures still lead to the typical wear pattern from overinflation (more in the center and less towards each side of the tread?) Just because you can air them up doesn't mean you should. You can do this with a passenger tire too, as long as you don't get too close to the stamped pressure limit on the sidewall. But you'll see the classic overinflated wear pattern.

Alternatively, on an LT tire, you should be able to air up and get WAY more load capacity out of the bed (subject to something else in the system getting overloaded, of course) without affecting tire performance.

Anyway, I'll probably plan to run closer to the posted 50 than the ~46ish the table says an LT tire should get (116 load factor = 2756 lb, take the 10% factor to get 2505, which is almost 46 on the dot on your LT chart), for the purpose of increased mileage :).
 

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Recognizing your analysis here (I did not know this about LT tires, but I try to stay away from our core business as much as possible!), wouldn't higher pressures still lead to the typical wear pattern from overinflation (more in the center and less towards each side of the tread?) Just because you can air them up doesn't mean you should. You can do this with a passenger tire too, as long as you don't get too close to the stamped pressure limit on the sidewall. But you'll see the classic overinflated wear pattern.

Alternatively, on an LT tire, you should be able to air up and get WAY more load capacity out of the bed (subject to something else in the system getting overloaded, of course) without affecting tire performance.

Anyway, I'll probably plan to run closer to the posted 50 than the ~46ish the table says an LT tire should get (116 load factor = 2756 lb, take the 10% factor to get 2505, which is almost 46 on the dot on your LT chart), for the purpose of increased mileage :).
Yeah, on the tire wear I think you are generally right about all of that. But it's not so cut and dry and depends on the tire too. And it's gonna affect performance, ride comfort, etc... But there no harm in experimenting.

As for the load, it's not about the tire, it's about the load capacity of the chassis/frame. Even though you might have LT tires, you DO NOT want to exceed the load capacity of the truck.
 

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How did you find the speed rating on the RIdge Grapplers? I'm looking on their website but do not see any specs related to speed rating.
You aren't gonna find any LT tires (that I know of) that will match the speed rating of the OEM tires. So if you're a speed demon who drives over 100mph...don't get em.
 

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I have 6,500 miles on my Cooper AT3 XLT Discoverer tires. They are load range E and I have run them at 60psi cold (63-65psi hot) and they have worn perfect, ride great and look fantastic. At 60psi range loss is negligible and they are as quiet as the Scorpions.

Ran Toyo Open Country on my Tundra for 130,000 out of the 160,000 miles, but the Coopers are proven for me and I hope to get 35,000 miles out of them.
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Those tires do look good. What kind of efficiency have you been achieving? I notice different wheels too, so that could impact it as well, but still curious.
 
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First, I want to thank everyone for all the feedback. Feel like I'm starting to become a tire expert!

The speed rating issue is something I'm trying to understand. It looks like the OEM Pirelli's have a speed rating of 126S. The Nitto Ridge Grapplers are listed as LT275/65R20 E 126/123Q on their website. Does this mean the speed rating is 126 for both?
 

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First, I want to thank everyone for all the feedback. Feel like I'm starting to become a tire expert!

The speed rating issue is something I'm trying to understand. It looks like the OEM Pirelli's have a speed rating of 126S. The Nitto Ridge Grapplers are listed as LT275/65R20 E 126/123Q on their website. Does this mean the speed rating is 126 for both?
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Yeah, on the tire wear I think you are generally right about all of that. But it's not so cut and dry and depends on the tire too. And it's gonna affect performance, ride comfort, etc... But there no harm in experimenting.

As for the load, it's not about the tire, it's about the load capacity of the chassis/frame. Even though you might have LT tires, you DO NOT want to exceed the load capacity of the truck.

Agreed 100% re: load. And please, internet, don't overload your vehicle and expect good things to happen.

I did see on another thread that some folks were putting pretty significant numbers in the bed, though. If you're doing this, and you have LT tires, air them up for optimal results :).
 

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That looks good - how's ride, noise, and efficiency compared to the stocks?
The ride is awesome, and I don't hear anything on the noise end ( definitely nothing like a mud tire or Nittos), but I also am always listening to music loud. I purchased with the 22s and only had them on for about a week. My needs don't really call for tons of range, so I haven't paid much attention. All I can tell you is at 70% charge, it states I have 215 miles range.
 

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The ride is awesome, and I don't hear anything on the noise end ( definitely nothing like a mud tire or Nittos), but I also am always listening to music loud. I purchased with the 22s and only had them on for about a week. My needs don't really call for tons of range, so I haven't paid much attention. All I can tell you is at 70% charge, it states I have 215 miles range.
Nice to hear - these are on my list to consider after I wear out the stock Scorpions. By the way, if I'm not mistaken, I am only seeing around 203 miles range at 70% with the stock AT's.
 

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I just replaced my stock Scorpion 20" with the Toyo Open Country AT3. (With my daily commute on steep, curving mountain roads, and with my proclivity for accelerating hard and using High brake regen, the Scorpions were just about completely spent at under 12,500 miles.)

I definitely feel a sloppier difference in the driving characteristics, above ~35 MPH. Changing lanes at highway speeds I feel like I'm driving a boat; there's some "slosh" as I steer into the new lane, and more "slosh" after I steer back.

I haven't noticed a problem with the noise, I like the way these look, and I hope they'll work better during the snow this Colorado winter. But the AT3's definitely don't feel great. The Scorpions made me feel solid even at max speed (which I should never have been driving); with these new ones I'd be hesitant to change lanes above 80 MPH.

Update: I had the tires inflated to 45-48 PSI. I have since pumped them up to about 65psi (tires are rated to 80psi) and much of the sloppiness and slosh is gone. Launching I still feel them pulling me left and right on the road, but for general driving I'm much happier now.
 
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I just replaced my stock Scorpion 20" with the Toyo Open Country AT3. (With my daily commute on steep, curving mountain roads, and with my proclivity for accelerating hard and using High brake regen, the Scorpions were just about completely spent at under 12,500 miles.)

I definitely feel a sloppier difference in the driving characteristics, above ~35 MPH. Changing lanes at highway speeds I feel like I'm driving a boat; there's some "slosh" as I steer into the new lane, and more "slosh" after I steer back.

I haven't noticed a problem with the noise, I like the way these look, and I hope they'll work better during the snow this Colorado winter. But the AT3's definitely don't feel great. The Scorpions made me feel solid even at max speed (which I should never have been driving); with these new ones I'd be hesitant to change lanes above 80 MPH.
Highly interested in your post/comments. Was giving the Toyo OC AT some solid looks after @COdogman gave a five dog paw rating/review of the Toyo’s. Your comments now have me seriously looking at the Falken Wildpeak AT3. Do you think the treads of the Toyo are too loosely-goosey/soft and flex too much when changing lanes/turning?
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