What is the point of front Dually wheels? - Dodge Cummins Diesel Forum
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Old 01-11-2010, 05:14 PM   #1 (permalink)
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What is the point of front Dually wheels?

I'm new to the Dually world, been driving SRW trucks most of my life. Can someone tell me what exactly is the point of having a massive offset on the FRONT wheels of a dually truck? I understand the rears are a two-pice/two-tire configuration with huge offset, but the fronts??!!

What is the point of having that huge offset slung way out in front of the wheel hub? Why are the front wheels only 6" wide?

The reason I'm asking is becuase I want to go with a staggered wheel configuration so the front tires don't look so puny in comparison with the rears.
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Old 01-11-2010, 05:21 PM   #2 (permalink)
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its so that all 6 tires are rotatable, look at the dually rims they are identical to the front rims with the same offset
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Old 01-11-2010, 05:21 PM   #3 (permalink)
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the wheels look the way theydo cause all 6 are interchangeable. Turn the front funny lookin wheels around backwards, and ta-da you got back wheels. The inside rear wheels face the same as the front, then the outers are the opp. and match up with the inners. IMO having staggered wheel/tire configurations would look funny, but to each his own. If the front wheels were mounted the same as the rears it would look funny. If the tires were staggered you couldnt rotate them all the way around, only the back 4 and then the front 2 with each other.
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Old 01-11-2010, 05:21 PM   #4 (permalink)
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if its factory all the wheels and tires should be identical aswell so they are all the exact same width
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Old 01-11-2010, 05:31 PM   #5 (permalink)
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Maybe I'm thinking outside the box here, but I want to run 255/80R17's on the rear (4) wheels, with an overall diameter of 33.06".

Then i want to run 285/70R17's on the front with an overall diameter of 32.71". Even though all 6 are not rotatable, I can still rotate left to right.

The difference in overall diameter is 1/3", which is about a 1% difference. Even on a full-time AWD truck, as long as you're under 5% diameter difference, there should be no issue of drivetrain wear.

Will a 285 sereis tire even fit on a stock dually wheel?
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Old 01-11-2010, 05:38 PM   #6 (permalink)
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I have 285/70/17s on my stock dually wheels, all 6 of them, and have spacers between the rears. Some people claim that the spacers arent reliable when towing, but between this truck and my last i have over 150k miles of towing with duallys that run either 33s or 35s with spacers, and i have never had a problem...
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Old 01-11-2010, 05:51 PM   #7 (permalink)
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Don't forget the spare - if the fronts are different from the rears you'll need two spares.
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Old 01-11-2010, 07:49 PM   #8 (permalink)
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if you're going to go to all that trouble, why don't you run super singles on the back?
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Old 01-11-2010, 08:10 PM   #9 (permalink)
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Will a 285 sereis tire even fit on a stock dually wheel?[/QUOTE]

yes they will! Look really good in my opinion. I am running a 2" spacer in between mine. Have a buddy runnin 285 bfg m/t s and he is running a 1/2" spacer and says they are fine. keeps pressure about 65 psi
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Old 01-11-2010, 10:56 PM   #10 (permalink)
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The only thing keeping me away from spacers and really thick back tires is the fact that the outboard tires protrude rather far outside the fender flare. There's the asthetic side to it, some people think it makes the dually look awesome, others like myself tend to think "overkill" when they see it. Then there's the functional side, in which mud and gravel get constnatly flung up onto the side of the fender, other crap goes flying upwards because there's no wheel-well to catch it.

To each their own, but I've decided I want rear wheels that FIT under the wheel well and prevent debris from being flung up. With this in mind, I'm limited to a 255 series tire in back with NO SPACER. But, what I was trying to accomplish is make the front tires look equally impressive by beefing them up to wider unit. The "staggered" dimensions I mentioned earlier I think will work and prevent the pizza-cutter look up front. Either a 285/70R17, or a 305/65R17 would work if it fits on the wheel. Both are close enough in overall diameter to function.

I'm not sold on the fact you'd have to carry two sizes of spare. The same size spare for the rear tire would probably work up front just fine. Sure, one tire would be 1" wider the other one with the spare on, but who cares? The diameter is almost identical.

**Geeks only beyond this point**

(You've been warned). Lets run the math. We've got an open axle up front which means the tires can easily turn at different rates (4x4 owners here). Using the simple formulate C=Pi*D, we can calulate the difference in rotational distance if a rear spare was used up front on the staggered design. That number is 1.11", meaning the 255/85 tire used up front would move 1.11 inches further forward per full rotation. Divide that number by the overall circumferece of 33.062", and we get roughly 30 rotations. This means that for every 30 full rotations of the taller tire, the spider gears would make one full rotation in the opposite direction, allowing the wheels to turn at different rates.

Pushing the math further... we know that at 60mph highway (limp home) speed, we are traveling at 1056 inches per second. And we know becuase of our tire circumference of 103.8", that means the tire is turning roughly 10 times per seond, or 10 RPM. We stated earlier that we need 30 revolutions to make one full turn of the spider gears due to different tire diameters in our theoretical situation. That means the spiders will make one full turn every 3 seconds, at 60mph, with a 255/80R17 on one front wheel, and a 285/70R17 on the other front wheel.

ONE TURN EVERY 3 SEONDS is NOT ENOUGH TO HEAT UP OR "BUZZ" THE SPIDER GEARS, HENCE, YOU'RE FINE TO DRIVE ON IT!

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All i'm saying is that "to get somewhere if you had to", you might not have to carry two size spares for staggered tires this close in diameter. The only advange to this is a front tire that is a 285 series vice a 255 series, 30mm difference = just over an Inch wider up front. If you wanted 2" winder up front for the "dump truck look", then go with the 305/65R17.
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