bonez

I would like to put a set of Moto Metal 951 20x10 rims on my truck. I've read so many threads about what will fit and what won't and it's still never 100% clear. This will be the setup that I want to run until I can get the cash to put into a 6" lift.

2007 4x4 Lariat SCREW
2.5" leveling kit up front
1" additional block in rear
MM 951 20x10 rims
Toyo Open Country M/T tires (33x12.50r20)
Bushwhacker Pocket Style Fender Flares (will add these to get an extra 2" of tire coverage)

I sketched out a little drawing which I think accuratley represents the stock rim and tire combo (18x7.5 rim w/ 5.5" of backspace and 275/65/r18 tire) compared to the MM 951 (20x10 rim w/ 4.79" of backspace and 33x12.50r20 tire).

From what I can tell (if I did my math right), it looks like the new combo will provide an extra 1.12" of clearance between the tire and suspension, and it will stick out 2.8" farther than the stock rim/tire combo. I think there is about 1" of overhang from the stock fender flares from where the tread stops (not the bulge of the sidewall) on the stock tires, plus and extra 2" from the bushwhacker flares, so I think it will cover the new setup.

Does anyone see anything that I overlooked or just won't work? In the end, I don't want the tires to stick out past the fender flares b/c of WV state law, and I don't want to hassle with trying to get an inspection sticker every year. Also, I don't mind minor trimming in the fender well/front valence area, but I don't want to majorly hack up my truck to make it work. Keep in mind that I drew this out assuming the right side of the drawing would be on the inside (closest to the suspension) and that I did not draw the height of the rim/tires to scale, only the width.

GATORB8

Backspace takes the wheel flange into account, the rim width does not. So you'll be slightly further out in both cases.

GATORB8

Missing the portion where I put a red arrow:

bonez

Ahhh ok. Assuming the added width of the wheel flanges on the stock rims and the aftermarket rims would be about the same, each would be slightly wider than I drew the up. The overall clearances on both sides of the new setup should still be about 3" extra on the outside and around 1" more clearance from the suspension?

GATORB8

The clearance change remains the same as your original calcs. Here's my math using offsets:

Your moving from a offset of around +32mm to -18mm, so rim centerline movement outward will be around 50 mm.

Going from stock 275s to ~317.5 will widen the section width by 21.25 mm (each side).

so your outermost tire edge will be about 71.25 mm or 2.8" further out than stock
and your innermost tire edge will be about 28.75 mm or 1.13" further out than stock

bonez

Thanks GatorB8...that's pretty much what I had calculated out. Nice to have someone else confirm. I think the new setup sounds like it will work, although I might have to so some minor trimming...not sure on that yet.