Blowtorch79

Hey guys,

Car is getting closer and closer....Hoping to have it back from the engine builder next week. Then, of course its off to the next shop for suspension/chasis mods...

Looking into some wheels and tires. Hoping you guys can check my math.

Wheels:

XXR 521's

Website Figures

Front:
18x8
5x120 bolt
+25 Offset
6.48 Backspacing
73.1 Center Bore

Rear:
18x10
5x120
+25 Offset
5.73 Backspacing
73.1 Center Bore

When I do the math from skulte I come up with different backspacing.

Example:

254mm/2+25mm/25.4+.25=6.23 and that is allowing for the .25

Based on the website I would need a spacer/adapter:
Front .73" or 24.9mm (added .25" for tire)
Rear .63" or 22.4mm (added .25" for tire)

I found a company that will make me hubcentric bolt adapter/spacers as follows:

Hubcentric 70.3
5x120.65 to 5x120
Wheelcentric 73.1

Do you guys think this will work? I would like them to stay tucked in the fender well.

Thanks for all your help guys!

//<86TA>\\

iTrader: (14)

All your math is messed up. Your metric conversons are off, and wheels are about 1" wider than the advertised width, so the 18x8 is 9" wide, that will affect your offset calculations. 1" is 25.4mm.

The 18x8 with a +25 offset has 5.5" of bs. You need something like a 1" spacer, whick will be hard to do with a bolt on adapter. No mods other than that. They will actually bolt to the car as they are, but will be too far inboard to look right.

18x10 with +25 offset has 6.5" of bs. A .5" spacer will position them nicely and you will have to do a small amount of hammering to the bottom of the front of the wheels well. You could run no spacer, but clearance wil be tight in the bumpstop area as well as where I told you to hammer, so a little more work will be involved to fit them.

Any slip on spacer MUST be hub centric and you will need longer wheels studs if the spacer s more than 1/4" thick. You need to make sure you have enough thread engagement or you can lose a wheel. I like to have 1.5x the diameter of the stud engagement, so in this case about .7"

paul_huryk

Phil beat me to it on this one...

Blowtorch79

Thank you guys....I need some help figuring this out. The advertised backspacing of those wheels are as follows:

Fronts 18x8.5=6.48
Rear 18x10=5.73

Please help me understand how you came up with the figures you gave me. I have yet to pick a wheel and would really like to be able to figure it out on my own.

Thanks,

Jim

Blowtorch79

Forget about it guys....I'm about to order either the Nite Train or Rated X Rushforth wheels.