I'm going to lower my GT this weekend on Steeda Ultralights and was wondering if anyone is running that wheel/tire setup and if the have any clearance issues with the wheel wells, tires rubbing, etc. Rims are 9.0" up front and 10.5" in back.

 

While I don't have the setup you're asking about, I have 255/35/20 out front on an 8.5 wheel and lowered and they are perfectly fine, no rubbing. You should be more than fine.

 

I'm running Ultralites with 19×9, 19×10. No rubbing at all. Actually, most cars are only getting about 1"drop in the rear, and about 1-1/4" in front with ultralites. So with 18"rims you will be fine.

 

I'm running Hotchkis Sport springs which have a lower drop with those tire sizes and have never had an issue.

 

Ok, thanks for the answers guys. Can't wait to get this done!

 

This was the GT500 stock rear 285/40/18 tires on 2010 GT500 convertible wheels on the front, with 305/40/18 tires on the back, car lowered on Steeda Sport springs:

 

Much easier to visualize, thanks for the pics Gabe.

 

These aren't 18's but might help show some width and height. I am running 275/35/20 all the way around. This is a 1.5" drop on a track pack GT with Roush suspension mods.

 

Sweet looking ride ShaneyUSA. After seeing the width of your tires I decided that 285's are the width I want for the rear tires. Thanks for the pics.

 

Thanks! Glad it helped.