staggered wheel size

[Rikki Kitto]

Can I use 18" x 9.5j one the back and 18" x 8j on the front?

[HPsauce]

You'll have to be very careful with tyre profiles to get the same overall rolling radius front and rear.
I know someone who has done it on an S8 and that's fine.

[Rusty]

Should fit with the right offset. Rear arches are big but fronts are 8.5J max really.

Just need to keep the rolling radius the same front and rear so 245 or 255 tyres with the right aspect ratio for the rear. 225 on the front.

I've been looking at 8 & 9 and I know Ryan has run anything from 7 to 9+.

Rolling radius may be in manufacturer specs or just use:

(Width x aspect ratio / 2) + (diameter x 25.4)

Make sure to get it within about 2% difference.

There's a thread somewhere with it all in.

[HPsauce]

Or just use an online tyre size comparison calculator. There are loads, here's one: http://www.willtheyfit.com/

[Rusty]

Yes

[Henkjan]

or use the wider tyres on the front, should reduce understeer. MTM did this on the RSR

[Rusty]

Can't really go wider than 235, so you'd have to run 215 at the rear...

It only undesteers at the limit, so unless you're really pressing on, you'll be fine on the road IMHO.

[rynaqui]

235 is the max on the rear, at most perhaps 245 with the right wheel width/cambet and offset..can't recall the right amount as it was some time ago now. 235 on an 8.5J at the rear with ET27-35 range.

Heading that direction myself but not for a while now, still some tweaking to do

[Rikki Kitto]

I had 245 on all round until I found out they should be 225

[Fat Audi 80]

245/40/17 with ET 35 on an 8" rim fit easily on the back standard suspension, I have been running this for 12 years....