I am looking for the correct offset and tire size for 18x7.5 and 18x8 also i have a 1.5 drop

 

With 18x7.5 you will need at least +50mm. I would go for +55mm.
225/40/18 (25 inch diameter) works pretty good with a 18x7.5 wheel. 215/40/18 (24.8 inch diameter) works also, but the ride is harsh and that tire size is pretty rare.

18x8 is not that great of a size for the rear. Mainly because it is recommended not to go above 245/35/18. You want the option to run 255/35/18. Get at least 18x8.5...I like 18x9.
18x8.5 - 60mm
18x9 - 65mm

These offsets are tough to find...and alot of wheels will push the limits. For example, I am running:

18x7.5 +48mm, 225/40/18, toyo t1-s
18x8.5 +50mm, 255/35/18, es100 yokohama

I think I have about an inch drop...dunno, I am using the comptech coil overs. But I will tell you that I rub sometimes in rear when I am driving fast over some dips in the road.

 

I am also having wheels made in 18"

so if I went 18X8 +55mm and 18X9 +65mm I should have no issues with a 1" drop

 

Twiztid,

Your sizes would be fine. If I can help with the tires let me know.

Jim 800-428-8355-364

 

jtem,

You can use either 18X7.5 or 18X8 in the front with anywhere from 48 to 55mm offset no problem. I also would recommend a 18X9 rear to allow for the 255/35R18 tires. You will find more options in this tire size. The offset would be somewhere around 55 to 65 mm offset.
If I can help let me know.
Thank you

Jim 800-428-8355-364

 

jim,

what tire size should i use if i want to put the 18x8 on the rear.

Thanks

 

Thanks Jim

 

What rims are those Unicron?
Ive been looking for Volk Te-37s in a gunmetal with a polished lip, Ive seen them in magazines on other cars but cant find them.
Does anyone know of another rim similar to that?

 

Try the LE37s by Volks and they make a gunmetal w/ polish lip