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Thread: Axle vs Tire rating Q
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09-14-2021, 05:23 AM #11
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NWbulldog“but thinking long term here, the people that throw on "super singles" instead of dually's... is it just about finding a better tire or is the axle in dually's really that much different?”
Interesting concept of replacing a dual wheel with a wide based single in the class 4,5,6 truck market. One in which I’ve been wondering how long it would take to have impact on the casual driver.
The wide based single conversion in the class 7 & 8 market was for weight savings of around 700+ lbs. per axel. The construction of the tire that was developed to fit this concept is a long way from the early eighties super single. The only real reason to convert to a wide base single would be for weight savings. Or, maybe it looks cool.2017 F-250 6.7 2019 273 MK
Retired Tanker Yanker
My your pleasures be many and your troubles be few!
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09-14-2021, 10:34 AM #12
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09-14-2021, 01:17 PM #13
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Axle ratings have nothing to do with axles. Every AWR on every pickup truck is less than the actual axle is capable of supporting. For example, the RAWR is actually limited by the "weakest" component in the rear suspension. That could be the springs, wheels, or tires. With that said, axle ratings are often manipulated...two trucks could have the same tires but one has them inflated to 80 psi from the factory while the other has them inflated to only 65 psi. It is even possible to have two trucks with identical axles/springs/wheels/tires yet completely different RAWR based on their GVWR.
GVWR is assigned to a truck for a host of reasons, often having nothing to do with how that truck is equipped. That's why you can arbitrarily elect to order a truck that is de-rated on paper to skirt registration, licensing, or DOT requirements. Many are devoted to their payload sticker, and that is a foolproof way to guarantee that you are within all limits. Others, like myself, look at individual components to determine the capability of their truck. That requires some thought and research and is not foolproof. Fortunately, most of us aren't fools.
My truck has a RAWR of 6340. My 295/65R20 Ridge Grapplers are rated at 4080 each! They are definitely not my weakest link! As stated by xrated previously, tires should never be the weak point in your setup.2019 F250 Platinum, 6.7, LB, FX4, High Capacity Tow Package
B & W Companion
2019 303RLS
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09-14-2021, 01:57 PM #14
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09-14-2021, 05:11 PM #15
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I assume you have changed the rear tires from the factory originals? I see the "35's" in your signature. The reason I say that, as others have alluded to, is the sum of the rear tire capactity (2 or 4 tires) MUST be equal to or greater than the rear axel weight rating. In your case it is 2x3195=6390# for the tires vs. a sticker (RAWR) of 7,000#. So you have put "lower capacity" tires on your truck. That is the reason for the difference.
As to our second question "if a rear axle on a 3500 DRW has a rating of 9750, what accounts for that big of a difference from the SRW?", I do not know the RAM axels but in the Ford Super Duties the SRW axel (either a Sterling or a Dana M275) is very different (and lighter "duty") then the Dana M300 used in the DRW trucks. The tube diameter, bearings, axel, ring & pinion, brakes, etc are significantly heavier duty in the DRW axel. This is what accounts for the big difference in weight ratings. Note: this is NOT saying the SRW axels are not good, just a difference in the weight capacity.
ChrisChris & Karen
Fort Collins, CO
2017 F-350 SRW 6.7 Lariat Value CC LB 4x4
2018 Solitude 310GK - Sold 7/2023
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09-14-2021, 09:49 PM #16
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Yes, spot on... and an unfortunate change in this case. Thankfully I got a good deal on them and the trailer we have is not nearly the weight of the GDs we are looking at. None the less... a lesson learned. Would have been nice to have the good ol LS boys to let me know that...
Understood. I didn't go to far down that road, so I would think it is probably a similar story to the Ford's. I only found one forum talking about it over roughly 30-min search, and there wasn't a ton of info... just while on the topic it got me thinking. More curiosity than anything. The tire issue was the main point of concern. Definitely time to swap them out. Thanks!---~-~-~-~-~-~---
351M & 2018 Ram 3500 SRW
25G fresh water capacity?
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