I am contemplating the setup needed to put 335-18-30 Hoosiers on the rear of my autox FD.

The ideal backspacing is often stated at 7.5 inches, but I find that 7.25 inches provides better tire clearance of the Improved Racing trailing arms.

I know this because the current wheels are 7.5 inch backspace (18x10+50 with Hoosier 285-18-30) and a 6mm spacer is being used to provide some clearance.

Back to the 335's. Using the CCW Backspace Calculator an 18x12 wheel with 7.25 inches of backspace comes out to 18x12+19.

To you fitment guru's does, that seem correct?

How about others with 18x12 wheels, what offset/backspace are you using?

 

I know Jake Namer (S1mpsons, hamfist racing) is running the same Rota 18x12s I am on the back of his FD with 335/30/18 A6s.

They're +20s, I don't know if he has spacers on them or not. but he also has wider rear fenders. I would ping him,

 

Thanks, I didn't know about that wheel.

That offset is made to order for the FD.

 

Hi,
C14 18 x 12 +18mm rear. Here with 320 Yokohama slicks which are just as wide as the 335 hoosier. Volk also has a new ZE40 rim in 18 x 12 +20mm which fit just as nice too.

 

Rear ZE40 18 x 12 20mm with a 335 hoosiers:

 

Thanks!

Your FD looks really good.

I would be interested in seeing details of that fuel filler relocation.

 

I have 18x11.5 rear +42MM offset. it comes very close to the stock rear trailing arm.

so 188MM you can go in. I am slightly stretching a 285/30/18 tire. with a 335 you will need less offset to bring the tire torwards the fender.

 

There's a fuel cell in the car so the OEM fuel filler door was covered up with the pettit flares. I have pictures if that is the route you are going.
Cheers

 

Please post more pics of your car!

looks amazing!

 

Taz, your FD is pretty damn legit my man