ppl...

would the offset of a mag wheel be written on the inside of the rim?

i have found wheels i want to get which are used but in good condition. the seller does not know if it will fit a S.

wheels are interstate so i cant try b4 i buy .. but he has sent me these details..

Numbers on back of rim ; ET40 8JX18H2

will these wheels be ok to fit the S.? in terms of offset?

thanks in advance!

 

What are the other dimensions i.e width and diameter?

 

those dimensions are basically saying 18" rim, 8" wide, +40 offset...

Now unless u plan to run a lot of camber these will stick out from the side.

 

This may be stating the obvious.....but you may want to check out the stud pattern also???

 

stud pattern is ok. but offsets are no good.

what offsets would work the best for the S for 18inch wheels...?

 

9thousand, that really depends on the width of your rim (and even tyres). You can calculate the difference in clearances relatively easy.

The offset of your wheel is basically the distance from the wheel's centreline to its mount point. To calcuate how "deep" the wheel extends from the mount point, add the offset to half the rim width.

So, for a stock AP1 rear wheel - being careful to keep the denominations the same - this is:

0.5*7.5*25.4 + 65 = 160.25mm.

For an 8" rim with a positive offset of 43mm:

0.5*8.0*25.4 + 43 = 144.6mm.

This means that, the 8" rim extends less inside the car, or more precisely is 15.65mm further away from the suspension than the stock wheel.

To calculate how far the wheel extends outward, subtract the offset from half the rim's width.

So, for the stock and example wheel we have:

0.5*7.5*25.4 - 65 = 30.25mm (stock)
0.5*8.0*25.4 - 43 = 58.6mm (8" rim)

This means that the new wheel extends a further 28.35mm than the stock wheel.

Your choice with rim width, but the wider you go, the bigger the offset that you need. You may also need to factor in any lowering.

 

My Work S2Rs are made for the S. They are 18x9 with an offset of 60mm at the back.

They fit beautifully even with 265s on them.

Doing the above maths:

0.5 x 9 x 25.4 - 60 = 54.3.

So perhaps those narrower rims will be OK

 

As Aus has already mentioned, thats the calculated way of doing it, or you could just check this thread:

https://www.s2ki.com/forums/index.php?showtopic=342793

It has all the numbers you need on the first page. Great thread.

 

great thread

thanks for all post. very helpfull.