will this wheel and tire combination fit well on my 85 FB?
 

i have a mostly stock 85 gs at the moment, i would like to put racing beat springs into it and also add some new wheels and tires i was thinking about a 15x7 wheel and a 205-50-r15 tire to go with it. do you guys think i will have enough clearance with that set up??

Combo works just fine....ive been running that setup for years. Depending on wheel offset, may rub a little, bit more than likely you will have no issue

Needs to be about a 20 mm positive offset.

how would it look if i had 0 offset? sorry to ask so many questions, i am just new into wheel sizing and that sort of thing. thanks for the help guys!

I believe a zero offset pokes out a little bit.
Check this out.
https://www.rx7club.com/showthread.p...hottest+wheels
Somewhere is the close to the end some one has a 15x7 0 offset Work equip knockoffs.
Love the look though.

Ignore that link up there but do look at pg. 22 at the bottom, 15x7 0 offset.
Here's a link on that fitting https://www.rx7club.com/1st-generation-specific-1979-1985-18/anyone-running-15x7-0-offset-wheels-205-50-15-tires-529548/
Sorry about the other link I though it had more sizing involved.
This is the link you want https://www.rx7club.com/1st-generation-specific-1979-1985-18/request-1st-gen-wheel-pic-comparisons-15mm-vs-20mm-vs-40mm-offset-etc-616806/page5/

Yea, 0 offset will poke out and if it is lowered will cause fender interference issues. Some people like the look but I think it looks ugh. The 20 mm offset looks perfect, fills the fender up nicely without too much fender rubbing.

my plan is to go 15x8 0 offset and roll my fenders because I like that look. what kind of wheels are you looking at?

im looking at getting a set of the pro series by diamond racing, 15x7.

with a 20 offset you'll need to roll the fenders a little.....

As has been mentioned, you will need to roll fenders even with a 20 offset. 0 just isn't going to work without fender flairs on a 8 inch wide wheel. Heck, 8 inch I think is too wide in general to run on the rear of an FB with a proper tire. If you stretch a 205 tire on it, it may work alright with a mild fender flair, but otherwise it won't work, especially if its lowered.

As for the 15x7's, 0 offset will likely hit the fenders very close to the outside and may not clear even with rolled fenders. Its up to you if you want to try, but I had to roll the fenders on my 82 with 16x7's with a 205 tire and 38mm offset and 15mm spacer (equalling a 23mm offet).

https://www.rx7club.com/1st-gen-general-discussion-207/konig-rewind-questions-793440/
He's a thread about a 79 Rx with a 15x7 20 offset wheel

If you want some lip in your rim a 15x7 with a 10 offset will give you enough lip but I believe you won't have to roll your fender as much a a 0 offset (well duh, but I hope you get what I mean).

As a side note you will not be able use your car as a daily driver (if you have bad roads) with the Diamond wheels.

why wouldn't i be able to use them daily?

also do you guys know of a similar looking wheel that would have the correct offset?

A larger wheel in general will cause your steering to become a workout at low speeds. Your ride will also get harsher. Over all the diamond racing wheel is a racing wheel it was never designed to take a beating from normal roads. Diamond racing wheels were designed to keep weight savings in mind. So the construction of the wheels is not as thick as a daily worthy wheel needs to be. Now, personally I say if you like it buy it, they're cheap and if anything happens you won't keep you up at night.
Also look into:
SSR Mk series - personal favorite MK2
Watanabe wheels - full custom wheels expensive though
Work equip - Work's old school wheels also a bit pricy
All of them are custom

i wanna say that my wheels are a +12mm offset. fronts are virtually flush with the fenders, and i have yet to have any rubbing issues under any conditions (+ im also running racing beat springs)

gsl-se has a different offset that's probably why