Largest Tire Levelled F350 with -ve Offset - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 10-29-2012, 06:44 PM Thread Starter
34H
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Largest Tire Levelled F350 with -ve Offset

I have a 2010 F350, and for replacement tires and wheels I've settled on Hankook Dynapro ATM 325/60R20E S126, on 2Crave NX1 20x10 -25mm offset. And I'm getting a 2 1/2" levelling kit.

Using basic dimensions from Custom rims, wheel tire packages for your ride - RIMSnTIRES.com, and using simple trigonometry, I figure that the new set-up will have a max radius of 19.22 in to the outboard corner. The stock set-up has a -40mm offset on the 275/65R20, and the max radius there was 18.42 in to the inboard corner.

So, the new set-up will require an extra 0.80 in radial clearance. When I turn the wheels to check existing clearances, it looks like I should be able to get away with the new set-up by removing the mud flaps.

Questions:

1) Has anyone run 325/60R20 wheels with just a 2 1/2" levelling kit AND a -ve offset wheel of -25mm?

2) Is keeping the new wheel offset closer to 0 the safer bet?


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34H
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post #2 of 3 Old 10-30-2012, 12:03 PM
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I have 37 12.50 20 with a -24mm offset with a leveling kit and I had to trim my inner fenders a little bit. An adjustable track bar will help even out the amount of trimming that you will have to do on each inner fender as the leveling kit without the adjustable track bar will shift your axle to one side.
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post #3 of 3 Old 10-30-2012, 01:15 PM
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Not knowing how the tire will actually shape out on that width rim, I'd say you need closer to a -65 offset to make it clear the inner fenders the same (same backspacing).

With this offset, the tires will stick out about 2" farther than stock.


For comparison's sake, using a 0 offset will move the wheel in 2.6" and fit inside your fenders.


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