zracin

so i spent quite a bit of time pondering what size wheels will fit my car. no one was exactly sure..so here are some diagrams and measurements i made in paint. These are for my car. yours may vary. I have a 1990 vert with Tein S-tech springs, and non-modified fenders. The third diagram is for rear fenders. I will do the front fender diagram when I come back from vacation next week.

For those who couldnt figure it out:


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CENTERLINE: true center of the wheel
OFFSET: the distance (measured in mm) between the centerline and the hub surface (where the wheel bolts to car)
In My diagram, I have all the measurements made in Inches, bc my straightedge and level square didnt have mm on them.

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THIS MEASUREMENT IS JUST FOR THE REAR (MY CAR WITH TEIN SPRINGS, YOURS IS PROBABLY A LITTLE DIFFERENT)
Rolling your fender gives you and extra 1/4 inch:




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SO CLEARLY THE RIMS I WANTED (XXR 521 [18X10 +25]) WILL NOT FIT BECAUSE THE WHEELS REQUIRE 4.02 INCHES IN FRONT OF THE HUB TO CLEAR THE FENDER, AND I ONLY HAVE 3.0625 INCHES AVAILABLE ON THE STOCK FENDER. THE SPACING IN THE REAR IS FINE THOUGH, SO IF I WANT I COULD GET OVERFENDERS IN THE REAR AND GO WITH THESE WHEELS, BUT IM NOT LOOKING TO DO THAT

zracin

RESULTING FITMENT OF THE 18X10 +25: (zero camber-see next post)

zracin

CAMBER IS THE DEGREE OF ANGLE YOU PUT ON YOUR WHEELS (ADJUSTABLE )
0 DEGREES IS OF THE PHOTOS ABOVE
THIS PHOTO IS MAYBE 20 DEGREES (CRAZY AMOUNT, BUT GOOD FOR DEMONSTRATION)
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You can see that the old points of reference (marked by the black dotted line) used to measure clearance are no longer applicable:

The very same wheel that will not fit into those measurements, fit (technically) with 20ish degrees of camber ( note the new clearance measurement lines in green)
Its important to know that while it increases your available space in the front of the hub, your available backspacing is reduced bc the angle now sends the top of the wheel potentially into the spring/coilover/shock. this wheel would more than likely now bounce up and hit the spring, despite its ability to "fit". Calculations need to me made very carefully if you plan to push your wheel/tire width to the max.


to make this wheel fit AND function, you would need :
1) a spacer
OR
2) adjust your camber to a lesser degree
OR
2) buy a smaller offset version of this wheel (the smaller offset would "offset"the wheel further away from the hub mounting surface)

Gryffinwings

iTrader: (3)

I was looking into this size, but it looks like it's going to be too big. Looks like I'll be downsizing.

zracin

It WILL fit (barely) with the appropriate amount of camber. Im still working on what degree that is exactly... there are a few people running these size rims on unmodified fenders. BTW does anyone know what the stock degree of camber is?

j9fd3s

iTrader: (3)

http://www.rimsntires.com/rt_specs.jsp

ive been using this, it obviously doesn't know where the fenders are, but its been quite handy

zracin

theyve added an aditional .5" on the backspacing for some reason (maybe they want .5" assured clearance? . i dont know why and hope their wrong.... 5 inch centerline + 25mm(.98 inch) offset = 5.98" backspacing, not 6.5"

zracin

I just ordered them. I will make them fit. Ill let you know how it goes

zracin

got rims in today. They look like some Ghetto BBS LMs, but I like em and they ae within my means. Ill try to fit them friday:

zracin

And they fit! Perfect !1/8 inch from the heat sheild, and less than that on the front side, tucking narrowly under a rolled fender. Without the lowering springs/camber,this is def not possible, but With Tein s-techs 18x10 +25 on 255/35/18 nexens will fit. 18x10 +24 probably would not without pulling the fender a wee bit