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Old 11-03-2013, 02:57 PM   #1 (permalink)
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"Mega truck" tires

I am starting to gather parts and ideas for a "mega truck" build. I want to run this truck in the trench, hill and hole, and have general big truck fun with the thing. Right now I have a reg cab chevy 2500 as my platform and I am planning to run a 4 link front and rear with probably a 20 inch coil over. Right now I am looking at Rockwell 5 ton axles. My big question is tire size. Where the hell do I start? I know that an R2 is the tread of choice but what diameter will give me the best performance. I know that's a loaded question but what's to big for a 5 ton axle and what's to small for what I want to do? I checked thorn birds won't work.
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Old 11-03-2013, 06:28 PM   #2 (permalink)
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what engine will you be running and and how much hp and tq comes into consideration
i see guys run 2.5 ton from 44inch tractor tires to 67 inch in the hill n hole
most guys i see like the smaller tractor tires so they have more wheel speed and a lower cog so they can make smoother turns
keep in mind you want enough travel for your shocks(stiffness) so your tire will not hit the body when landing from jumps
but not a crap load of lift on truck to the point where u have way too much clearance and cog is higher than it needs to be
Trucks Gone wild june 28th 2009 Hill N Hole Bithlo Silver Jeep - YouTube
this vid is describing what i mean but you could go with a little bigger lift
btw 5 tons are kinda over kill unless u plan on using 700+ hp motors and 73+inch tractor tires
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Old 11-03-2013, 07:02 PM   #3 (permalink)
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I was looking at 2.5 ton axles but at the moment near me I can get a set of 5 tons cheaper and I figured the bigger the better. I would love to put huge horse power in the truck but right now I am a bit budget minded. I am thinking about running a stand alone chevy 6.0 with a cam and maybe a small bump in the compression. Then throw an aggressive tune at it and hopefully it will be in the 400 450 horse power range. I am trying to spend the money on the suspension, axles, and I want to buy a drop box. I can always add motor later on. I agree with keeping it low I plan to build it low but with some good travel. I was thinking some where in the 55 inch tall tire range. But will that put me at a big disadvantage running with the "mega trucks"? Around here once your over a 1 ton drive train and running ag tires it puts you in the class with all the big trucks.


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Old 11-03-2013, 07:34 PM   #4 (permalink)
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okay key to winning is wheel speed smaller tire less hp and tq needed to get those ag rolling and taller tire obviously vice versa what type of hp are these guys running
also what type of track like it a horseshoe or straight line
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Old 11-03-2013, 08:20 PM   #5 (permalink)
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So far what I have seen is a lot of a straight line racing, the trench is deep mud not a very fast event for most trucks. Winner is determined by who gets the farthest (it stops 90% of the trucks) and if more than one make it out they go by time. Hill and hole is a timed run and it's similar to most places a straight line with 3 or so jumps into the mud fastest time wins. There are some other odd ball events as well, like they run some what of a free style at one of the mud runs where you can hit a few jumps or cars. This is what I have been seeing the most near me, but I defiantly do not make it to all the events so I am sure there is more variation. I agree that horse power and wheel speed is key to clean the tires out I am just trying to get a good platform to build off of. I don't really want to spend a few thousand on tires and wheels twice.


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Old 11-17-2013, 10:09 AM   #6 (permalink)
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From what you describe you'd be doing alright with a 18.4/26 or 18.4/28. Also depends on what gear you put in your drop box.
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Old 11-17-2013, 05:29 PM   #7 (permalink)
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It seems most of the drop boxes have plenty of gearing options so the sky is the limit there. I just want to make sure I don't spend a grand or two on tires and realize I went to small or to big.


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Old 11-19-2013, 05:51 AM   #8 (permalink)
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If you are going to mess with the 6.0 for more power, with 5tons a 3.5:1 gear would be as shallow as I would go in the transfer case with a 18.4-26 or 18.4-28. My bud has a programmer on his 5.3/th350/3.0:1SCS/2.5ton/14.9-28 and it will flat get it, seen below. With the power bump from a 6.0, and whatever you do with it for more, a 3.5:1 will be real nice with the added height/width of a bigger tire and the inherent shallower gear from the 5tons. With a 3.5:1 on 18.4s the gear would be right along side a 3.0:1 and 14.9s.




Another truck in our group has a '97 F150 with a stock 5.4L/trans/case/3.75:1SCS/5tons/18.4-26s. It moves pretty well down the road with the factory transfer case in 1:1, but when it gets down in thick stuff it usually needs low range in front of the SCS. A mild 6.0 should be much stronger than a 200k mile 5.4L.
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Old 11-19-2013, 07:39 AM   #9 (permalink)
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Quote:
Originally Posted by Cplourde10 View Post
I am starting to gather parts and ideas for a "mega truck" build. I want to run this truck in the trench, hill and hole, and have general big truck fun with the thing. Right now I have a reg cab chevy 2500 as my platform and I am planning to run a 4 link front and rear with probably a 20 inch coil over. Right now I am looking at Rockwell 5 ton axles. My big question is tire size. Where the hell do I start? I know that an R2 is the tread of choice but what diameter will give me the best performance. I know that's a loaded question but what's to big for a 5 ton axle and what's to small for what I want to do? I checked thorn birds won't work.
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Old 11-19-2013, 07:58 AM   #10 (permalink)
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Those are some pretty sweet trucks. Where do you guys buy tires and wheels, I have found some options but there all pricey. There has to be a way to get tires for less than 1200 a pop. I notice you said guys run there factory transfer case to the drop box? I was planning on buying a 2wd th400 to eliminate the transfer case. Do they leave the stock case in to keep cost down or for more gearing options?
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Old 11-19-2013, 09:19 AM   #11 (permalink)
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The Ford kept the factory transfer case because it was simple, and he doesn't have a lot of power; the extra gear does help in the thick stuff. He is really the only one in our group with dual cases (factory case to a drop box). Most of my friends run 2wd transmissions in front of the drop box, all were originally 4wd trucks; just swapped in 2wd trans.

As far as tires, we're close enough to agricultural areas to have a large enough supply for people to keep an inventory of tires, keeping costs down. CraigsList or forum classifieds is where most people get theirs tires. Not real sure what the tractor tire scene is like in CT, but I guess there aren't really a lot of big tires moving.
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Old 11-19-2013, 12:44 PM   #12 (permalink)
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Ya tractor tire scene blows around here I keep an eye on craigslist so maybe something will pop up. The tough part is finding the size I want, when I do find tires they are the wrong size.
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Old 11-19-2013, 01:35 PM   #13 (permalink)
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They make some pretty gnarly tires, I was just hoping to sneak buy for a bit less money to get the project rolling but it's probably worth it.
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Old 11-19-2013, 06:07 PM   #14 (permalink)
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find local(farm/construction) equipment auctions thats where most people buy from
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Old 11-23-2013, 11:08 AM   #15 (permalink)
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Call a farm tire store. Ask if they have any used or know of any farmers selling used tires. I did that and got 4 16.9r24 on wheels for $800. Two have 3/4 tread and the other two have only 1/4.
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Old 11-23-2013, 12:34 PM   #16 (permalink)
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Call a farm tire store. Ask if they have any used or know of any farmers selling used tires. I did that and got 4 16.9r24 on wheels for $800. Two have 3/4 tread and the other two have only 1/4.
That's the kind of deal I'm looking for. I just need something to get it going and get my feet wet with it before I go bad shit crazy spending money.


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Old 12-11-2013, 08:19 PM   #17 (permalink)
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I have ran 16.9/30 BKT 171's (58") and 14.9/28 Titan Checkmarks (54") on my 5 tons. For up north either of those sizes should work well. 16.9/30 would probably be about perfect. I strongly recommend grooving whatever you buy. Also as said above the right gears in your drop box can make a huge difference. I would run around 3:8 to 1 in deep mud and 3:2 on hill n hole with a 400-450 hp motor and 5 tons.

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Old 12-19-2013, 11:13 AM   #18 (permalink)
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I would love to find some 18.4 x 16.1 stuff
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Old 12-21-2013, 03:30 PM   #19 (permalink)
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I would love to find some 18.4 x 16.1 stuff
I believe that's what my Titan R1s are. Paid about five hundred a pop new, run 'em on 16" rims, no problems.

Used to be you could get Apple tires in the same size for nearly half the price, they were less ply, but the benefit there is they weighed less. Who knows somebody might still have some laying around. My buddy runs them and even on double beadlocks they weigh six pounds less each than my Titans on steel rims.

In case anybody asks, I bought them at.....Les Schwab

Yea, I was shocked too, after calling all around I only checked with them for shits and giggles, but they ended up having the best price. Go figure. Guess it helps living in a rural section of the state.
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Old 12-27-2013, 12:13 PM   #20 (permalink)
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If your running ags and starting from scratch, don't limit yourself by choosing anything under 20" wheels. That way if you want wheel brakes one day, you have the room to do it. Nothing worse and more restrictive than small rims.

The only 2 reasons we used to run the 21.5 x 16.1 ag tires was the massive sidewall for low disturbance flotation at 4psi. The other was the 16" rims. Now 22", 24", and 26" rims are readily available.

Also stepping up the rim size help lower the cost of each tire due to it not containing as much rubber. Look through the catalogs and find the most common size. Common = lower cost.

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Old 12-27-2013, 04:55 PM   #21 (permalink)
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If your running ags and starting from scratch, don't limit yourself by choosing anything under 20" wheels. That way if you want wheel brakes one day, you have the room to do it. Nothing worse and more restrictive than small rims.

The only 2 reasons we used to run the 21.5 x 16.1 ag tires was the massive sidewall for low disturbance flotation at 4psi. The other was the 16" rims. Now 22", 24", and 26" rims are readily available.

Also stepping up the rim size help lower the cost of each tire due to it not containing as much rubber. Look through the catalogs and find the most common size. Common = lower cost.

Nat
Are a lot of guys running wheel brakes?
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Old 12-27-2013, 10:03 PM   #22 (permalink)
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Are a lot of guys running wheel brakes?
I will let others where you live answer that.

Where I live a truck is useless if it can't be registered and insured. We must have wheel breaks to pass a insurance safety. Can't use public land or even cross public roads without.

Failure to comply here adds up to just under $5000 on the first offense.

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Old 12-28-2013, 02:26 PM   #23 (permalink)
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Are a lot of guys running wheel brakes?
I saw one truck with 2.5ton rear wheel brakes the other weekend at a ride. That is the first truck with wheel brakes on a non-light truck axle. 99% of 2.5 and 5 tonners run pinion brakes (some planet guys have brakes in the planet housing).
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