335/30/18's Tires on a C5
12-13-2008, 09:44 PM
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335/30/18's Tires on a C5 Hi all, i'm wondering what the proper backspacing is to have a set of my thin spokes widened to 12' to fit a set of 335/30/18's on the rear. Realizing i probably will have to tub it to fit them inside i just cannot hook up at the track otherwise. My 295/35/18 drag radials aren't cutting it so i'm even thinking of running some 16" firebird wheels with bias ply slicks to hook it up. What do you think?
12-14-2008, 01:08 PM
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Hi all, i'm wondering what the proper backspacing is to have a set of my thin spokes widened to 12' to fit a set of 335/30/18's on the rear. Realizing i probably will have to tub it to fit them inside i just cannot hook up at the track otherwise. My 295/35/18 drag radials aren't cutting it so i'm even thinking of running some 16" firebird wheels with bias ply slicks to hook it up. What do you think?
A 335 on a 9.5 wide wheel is totally not recommended. 
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12-15-2008, 08:03 PM
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18X12's with 335/30/18 BFG KDW's. I think if I where to run any other tire then the KDW's they would not fit. The sidewalls are rounded off more then any other 335 i have seen. They do rub a tiny bit on the inside fender well when I creep over a curb or hit a large bump. My car is also lowered on stock bolts.
12-16-2008, 11:05 PM
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Nitto's generally run a little narrower than spec'd. Many C5s are running their 335s on 10.5" Z06 rears without too much trouble. Sometimes depends on your alignment, lowered stance, and rear shocks.
12-18-2008, 02:22 PM
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Just like the Hammer said they do rub a little on the top of the inner fender when you turn up into a steep driveway. My car is an 02' Vett lowered 1" all around. I've been running 285/35 x18 0n 10.5" CCWs in the front and 335/30 x18 on 11.5" CCW classics in the rear, along with Michelin Pilot Sports, on my car for over 4 years with no issues. There are a couple of problems though, 1) they cost alot and 2) they are nail and screw magnets 
12-19-2008, 11:12 PM
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I run aftermarket c5z06 wheels in 20x11 in the rear with Michelin Pilot Sports in 325/25/20 with no issues on a C5 coupe. Just have to get the right offsets/tires.
