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Old 11-26-2007, 04:41 PM   #1
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Largest Tires on a SMB 4x4?

Without modifying the standard SMB 4x4 has anyone figured out what the largest tires I can fit are?

I don't mind a little rubbing at full stuff, just as long as I don't tear up the fenders.
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Old 11-26-2007, 07:12 PM   #2
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I am not sure if you are asking diameter, or also width.....

...but I am hearing that 35in diameter is the largest without modification, and that there is a little rubbing with 35s.
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Old 11-26-2007, 07:17 PM   #3
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Yeah width too. I'd like to maximize diameter first and then width. I thought the 35" tire option included more lift from SMB to fit the tires.
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Old 12-05-2007, 07:36 PM   #4
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BIG TIRES

I had 315's installed on my SMB by the guys in SMBW. They had to trim some sheet metal off the corners of the front fenders and reinstall the Bushwackers. At the same time they installed running boards which turned out to be too long and the new 35" tires hit these in good twists. I trimmed about 1/2" off the back of both boards. There was no lifting done although I did add some leaves later that gave me lots of clearance. Erik and Amy Badger are running 37" on the Badgermobile. I expect they will have full details on the switch on their website at badgertrek.com.

Remember going from 33" to 37" is a big jump and will effect horsepower significantly. Ford chose 4.10 gears to go with stock tires at about 30", so going all the way to 37" might require a change in gearing.

Alan
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Old 12-05-2007, 11:24 PM   #5
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I ended up with 4.88 gears to match the 37 inch tires, resulting in 65mpg at 2200 rpm with the diesel, and no reprogramming for the pcm shift points.

I rarely feel the need to go faster than 65, and have yet to be disappointed with the performance.
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Old 12-12-2007, 08:56 PM   #6
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UPDATE new news on largest tires for SMB

We are now hearing that 35 inch is the largest tires SMB will install, BUT that 35 inch does require some "rocker panel modification".... but it must be minor since they will not install 37in tires due to the required modifications.
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Old 12-12-2007, 10:33 PM   #7
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I was going to go with 34s but the only Nitto Terra Grappler that comes near 34" is like 12" wide or something. I won't do anything til I see how the SMB fits in the garage at the rental house- bigger tires might be moot if it's as close as I think.
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Old 12-12-2007, 10:40 PM   #8
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Tires

The lower you go on gears the weaker they become... the pinon gets real

small... 37inch tires on a 10000 lbs vehicle with 30 spline axles is asking for

trouble off-road.


JM
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