Using a combination of 200TW BFG Rival S tires
245/40/18 25.7"
315/30/18 25.5”
275/35/18 25.6”

With typical track suspension and alignment

What is the proper offset for 18x9 front and 18x12 rear?
What about 18x9.5 front and 18x12.5 rear?

Thanks
Kevin

 

My plan is 245/315 or 305 as well on 9" &12" wheels. I also have several twists that I'll use from time to time and in the past used 7mm and 15mm F&B.

What wheels are you using and are you AWD or RWD?

 

I have stock twists and GT3 wheels, both 8/11. I'm hoping to run 9.5/12 with a new set. I could go conservative and use spacers as needed but would rather not. I'm hoping someone here has experience they can share.

I'm not aware of any competitive 305/18 tires in the 200tw category. There are a few 315's.

I'm AWD.

 

The turbo twist from the GT2 is a good place to start with offsets. When I had a set on my turbo I used no spacer up front and a 7mm in the back and it looked and drove perfectly with 235/315 tires.

The 305 rear tire is nice but too tall for AWD. I use them on my GT3 and now on my 6TT as it's RWD as well. But if using Hoosiers R7s 315s are my only option.

 

Depends on height and rolled fenders etc but +40 is pretty safe for 9/12

 

Front offset will depend on suspension set up, diameter of springs, type of upper mount, amount of LCA shims, type of wheel, tire size, etc.

18x9 ET 45 ..... This will work with all run of the mill set ups...
18x9.5 ET 40-44 ..... Light mods to run 245, Heavy mods required for 265-275.
18x10 ET 36-38 ..... Heavy mods+ required for 265-275

Rear offset will depend on suspension set up, fender liners brackets, and amount of fender roll, tire size, etc.

18x12 ET 45 ..... This will work with all run of the mill set ups with light mods
18x12 ET 40 ..... Fender roll generally required
18x12.5 ET 45 ..... Light mods to run 305/315, Heavy mods to run 335
18x13 ET 45 ..... Heavy mods+ to run 335

 

Thanks for the replies and information, just what I needed.
Kevin