Hey guys, I am about to buy some 15x8 rota rkrs with +10 offset for my 83 gs. I was hoping that someone out there has something similar so I can see the fitment before I take the plunge. I am sure they will fit but I want to be sure they will look good. Thanks!

 

15x8 +10 is going to be tight at least for the front and would probably require the fenders the be rolled if they work at all. Also the turn radius might hit the lower control arm or front sway bar. The go to size on 15" wheels is 15x7 +20mm.

 

I use willtheyfit.com to compare widths and offsets to either the stock rims, or what I have now. You fill in the specs of the two wheels you're compaing (and tire sizes) and it shows them "over-lapped" so you can see how far the new ones will poke out (or in).

I put your 15x8+10 in compared to the popular 15x7+20, both with 205/15r50 tires. The inner part of the rim is almost exactly the same on both sizes, but the outer lip is 1" wider. I think the 8"s would look good on the rear, but you better check the front fender clearance carefully. I think the stock rims are 13x5.5+17 (?)

The picture below is 15x7+20 with 205/50-15's. Your 15x8+10 will stick out 1" farther (the rim anyway).

 

And with even that clearance, you will want to roll the front fenders (*only), or you'll be cutting the tire shoulder when you hit bumps. Get the right tools if you value your paint; using a jack and a softball bat is a good way to crack up your fender edges unless you know what you're doing.

 

Did that at DGRR when I first ran hard on the dragon with Konig Rewind 15x7 and 205/50x15 Dunlops. Used my BFH handle and rolled the car with the handle between tire and fender. Sure as hell cracked the paint. Worked in a pinch but not advisable.

 

yup. also be careful to not over roll them when using the roller tool that bolts to the hub. the fender will stretch a bit and you'll have to fix and paint.

go slow... i.e. roll it a bit one side, then same amount on the other.

 

Think I'm going to go with a 195 up front to avoid rolling the fenders with Konig Rewinds 15x7 20mm. I cringe whenever I see a bad fender roll and tell myself I'd never do that.

 

I have 195's on front (225 on back) to give me a little extra clearance. (GSL-SE suspension w/ 15x7+25et rims). So far I havn't rubbed the fenders but I'd like to get a slight roll just to be safe.
Front:

Rear:

 

Fender Rolling; it only takes a little, and some people seem to think you're folding it flat, which ruins the fender edge. You only need enough roll to keep it from slicing the tire rubber.

 

You should use a heat gun and a proper fender roller if yo would like to preserve your paint.

 

Even with that, it's hard not to crack the paint. Especially if it's your first time.

 

I run 15x8 wheels on my race car. It is lowered, allot and that complicates things. The real challenge with an RX7 is that front and rear track measured at the hub faces is really different front to back. In short, the car is wider in the back than it is in the front. My brakes are different and that may matter. But even when the car had GSL brakes and 13x7" wheels there was a noticeable track difference.

I have tried 15X8s that were +15MM and they fit pretty well even with the car lowered a decent amount. Later when I adjusted the suspension to get the car even lower I needed wheels with more back spacing so now I run 15X8s that are +35MM. In addition to moving to the +35mm wheels I went to a 4x100mm pattern because there are more choices in the PCD and the wheels are generally lighter. To do the PCD change I redrilled the GSL axles to 4x100 and also redirlled the rotors. On front I had 25mm thick adapters made to convert from 4x114.3 to 4x100 and then added another 10mm spacer to get tire clearance just right. Everything is hub centric. Tires are 205/50x15 on front and either 225/45x15 or 205/50x15 on the rear. This all depends on tire brand and last year I ran Goodyears and in the past I ran Hoosiers.

The front fenders on my car have the lips flattened and then were massaged on an English wheel. The rear wheel well have the inner lip pie cut, flattened and then fiber-glassed over. Its a race car so things aren't perfect but I have never had any fender clearance issues.

Side view 15x8+15mm wheels at a higher ride height - this is still allot lower than stock


View from the rear 15x8 +15mm wheels


15X8 +15MM Wheels with 205/50x15 Kumhos in an Autox


15x8 +35MM Wheels with 205/15x15 Goodyears. Final ride height settings


15x8 +35mm wheels on track

 

That is one Beautiful car! Makes me almost miss my track car.