Widened front rims

[Cougar_Marauder]

Hi all,

I plan on having my rims widened soon but there is not much info on the front rims. I plan to have the rear rims widened to 9.5-10" with 295/45 18 and the fronts to 9.0-9.5" with 275/40 18. The rears are well documented but the only real info on the fronts I could find was Motown running 10s all around with no issues but there is no detailed info on that. I know I would need a 0.5" spacer (all around) if I go 10"rear and 9.5"fronts. Does anybody have any experience/knowledge if this will work without any problems or additional modifications?

[str8pipe]

Popcorn waiting

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[1Marauder]

With butter!

[FordNut]

I know of nobody widening the fronts. There have been a couple of skinnies though.

[crouse]

I run 2007-2009 Shelby GT500 wheels on my Marauder when I run Auto-Cross events. They are 18x9.5" wide and I run Falken Azenis RT660's in 294/40-18 with no rubbing on the front or rear.

However, the offset of the GT500 wheels makes them stick out a little more than the stock Marauder wheel.

So, if you widen the front, you may have to run a spacer.

You could probably run the 275 on the stock Marauder wheel. I run a Nitto NT555 in 265/50-18 on the rear and they look and work just fine. I looked up a 275/40 tire and it shows a rim width range of 9-11". I've heard of some here running a 295 on the stock Marauder wheel. Some tire stores will not mount tires on wheels wider than what the tire manufacturer recommends.

[Cougar_Marauder]

Upon further research I have decided to go with a 20" rim setup instead of widening the stockers (even though I love the stock look).

From what I can find for the rear 20x10 +40mm offset with 305/35-20 should work (or 20x11 but that is hard to find a match with a skinnier front). For the front most people seem to go with 20x8.5 with 255/35-20 which is OK but I still keep finding posts by Motown that say he ran 20x10 +40 all around but can't find what tire size he ran.

Looking at crouse's setup I would think I should be able to do a 20x10 +40 with 295/30-20 up front, it's nearly the same size, a bit smaller even.

Any words of wisdom or insight would be welcome on this. I should mention I do auto-cross (and occasional drag) so I am really trying to optimize cornering/handling as far as tires go.

[RubberCtyRauder]

And Motown needed to run 1" and 1.5" hubcentric spacers to fit those wide wheels and larger tires. 10" on rear depending offset may rub on rear shock boot.

[Cougar_Marauder]

From what I gather, the spacers are only needed for the stock rims or stock offset of +50 on 8" wide wheels. No spacers needed with 10-11" rim at +40.
The biggest problem now is finding a set that wont break the bank. Ideally I want 20x10 +35-40 in front and 20x11-11.5 +40 in the rear.

[Cougar_Marauder]

It's been a while. I did more research and ran my own calculations and came up with very different numbers than I found on here previously. An OEM Marauder rim has an offset of +50.8mm(2") on 8" ID; making it a pretty damn high offset. Increasing the rim width toward the shock increases the offset even more. Luckily our cars have a bit of leeway in both directions. I found Porsche uses high offset rims on many of there models. I pulled the trigger on some Porsche Panamera Turbo rims that come in at 9.5x20 +65mm in the front and 11x20 + 68mm in the rear. I used 15mm spacer/adaptors to mount them. The adaptor mounts to a 5x4.5" lug 70.6mm center bore (Ford) and converts to a 5x130mm lug 71.5mm center bore (Porsche). The Porsche rims are even hollowed-out between each lug hole so I didn't have to cut down the OEM studs. The tires that came on the rims were 255/40 in the front and 295/35 in the rear. The fronts stick out just a bit more than I wanted but not too far and clear everything just fine. The rears stay tucked inside the fender and have about 1/4" clearance to the shock. I wanted to go with 305/35 for the rear but since I'm so close with the 295 I think I'll stick with it. Maybe with a 20mm spacer in the back 305 would be just right. The 5th pic shows the rear wheel after the car was set down with air ride off; there is still 1/4-1/2" gap to fender.
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