Hi everyone,

I’ve done some searching and haven’t been able to get an answer on what the widest rear tire you can run on the rear of an FC with +30mm overfenders, Shine or otherwise.

It seems most people running these fenders are more apt to have wide wheels and stretched tires rather than the widest tire that'll fit.

I have the option to run a 17x10.5 +27mm or a 17x10 +38mm wheel with whatever spacers I need to clear control arms and would like to jam the biggest tire under the car I can fit. I currently have the 17x10.5s with a 275/40/17 on stock fenders with a roll but would like to fit a 315/35/17 as that’s really the only next size up with lots of sticky options. There aren’t many 295 or 305mm 17” options.

Thanks,
Alex

 

I run 18x10.5+15 RPF1 in the rear with my Shine over fenders wrapped with 285/30-18 Advan AD08-R. Could probably fit a 295 which is what I'm going to try when these wear out. 305 would be unlikely but maybe. Have you tried anything since this post?

 

I haven't. I have 18x10 +10s and was planning on buying Federal RS-R 285/30-18s. The wheels fit under the fenders okay. I'll update the thread when everything is fitted.

 

315/35/17s will be a tight fit. They will probably hit something unless you raise the car. 285/30/18 is a better choice. Otherwise run a sticky 275/40/17 on a 10.5 +27 offset with a thin spacer. They are taller unfortunately though.

 

This gives you a good visual of what my setup fits like, If i were to sand away at the inner lip I think I could fit 295s without negatively affecting the cosmetics.

 

Thanks, Keith. That fits really well. I ordered some 285/30r18 Federal RS-Rs today. I think they'll fit well. I'm running the same wheels on the front (Foregestar CF5 18X10 +10mm) but mostly likely with a 255/35r18 since there's there's no tires in their line up in between.

Btw, what wing and side skirts are those?

 

Those are probably the best bang for the buck ultra high performance tires out there. Take a picture of how they fit when you get them on. The side skirts I made myself, same as the gurney flap, it's just mounted to a stock S5 spoiler. I don't have the shine diffuser on in the picture as I plan to get the car painted soon and it's a pain to take off and on. It's a nice piece though.. transforms the car.

 

Share some more pictures of the spoiler if you don't mind.

 

Here are a couple of 275/35/17s on stock pulled rear fenders. These tires run BIG, and are as far inward as I can take them without rubbing. They just barely fit.

 

I ended up upgrading the 295/30R18 R888Rs I had on the car to 315/35R17 Nitto NT555RII drag radials. They are absolutely massive. Almost 13" mounted on 17*10.5 +27mm tires
The fender clearance was adjusted by sanding the inner lip of the Shine +30s, but I've also swapped the Ronin Stage3 camber links for OEM ones for now. There's still quite a bit of room at the top of the fender, so I may try going back to the Ronin stage 3, or buying stage 1 or 2 dog bones.

The inner clearance at the control arms was non-existent with the higher +27mm and wider wheels/tires. I ended up hacking and grinding the trailing arms, then 3d scanning them and modeling in Solidworks. Then I drew up patch panels for 3/16" steel plate that SendCutSend laser cut and bent. They matched the 3d printed protos (yellow in photo) and welded in just fine.

The fresh, stickier, and wider Nittos are absolutely awesome on the street. Way more traction, better ride with more sidewalk, and much quieter to boot.

The DCT gearing is very short, but I can hook up over 600wtq in 3rd gear, which is 1.8:1. It pulls over .7 long. Gs at 60mph now.

The overfenders also got a much-deserved respray and I added some RE-style side skirts to match the FC2000 front end. The chrome FR500s aren't to everyone's taste but they're growing on me and seem to get more compliments that my old Forgestar wheels. Anyways, figured some of you might enjoy seeing how much meat can fit under +30mm fenders