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I run 315's on z06 rims and you can still fit a finger between the tire and wheel well..
you should be ok with a 305, I know that with a z06 back rim the biggest you can go is a 315, and I believe a c5 wheel is a lil smaller.
Hope that helps
__________________
02 Z06 385 rwhp/381 rwtq- "Harris Tuned"
Breathless Intake | LG Long Tubes | Sparco Evo Seat | R&D Roll Bar
98 Pathfinder "daily driver" "There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.”
~Ernest Hemingway
hum,so nobody on ls1tech knows the biggest tire size that can be mounted with no problems on stock c5 rims? any help would be appreciated..
On STOCK C5 wheels...I run 295's. Certain brands, ast differently on the wheel. Some are wider,...etc. For example, I had Goodyear F1's(factory stock C5 Z06) and they buldged slightly. Now, I have PILOTS....same size, yet, the wheels are nearly as wide.
I have 335-30-18's michelin pilot sports on my 18x10.5 Z06 motorsports. And yes they bulge out some but thats ok with me.
__________________ current cars
98 White SS clone. was 9s now back to bolt on driver
old cars gone
2013 5.0 auto full bolt ons 175 10.5 @ 126, 2012 GT500 21 psi 800hp 10.6 @ 136, 00 Blk hawk 11.3's ? NA, 02 SS NBM408 glide 9 inch 10.3's NA, 99 FRC vette tt solid axle 850 rwhp on 13 psi, up to 23 psi EST 1200 RWHP no dyno or track .06 ZO6 11.5's, 03 ZO6 cam only 11.4's, 98 Formula built 6 speed 9.7's@144
On stock C5 (non Z06) wheels the largest size tire you want to go with on the rear is 295/35. Even this is larger than recommended for a 9.5” wheel, but it has been proven to work fine.
A 265/40 or 275/40 is recommended for the front to keep the front to rear tire height differential in the correct range (to keep the active handling and traction control functioning properly).
I also ran 295's on my C-5 9.5" rims. Worked great.
__________________ 2002 A4 M.Y. Corvette Coupe
Fully built 346 by LG Motorsports
ACE tranny, Vig 3400, GTP Stage II heads and Torquer V.2 cam, bolt-ons + N2O
New dyno and track numbers to come...
Old numbers:
Best ET/Speed: 11.74/117 N/A
10.96/125 N20
I run 335/18 nittos drags on my stock Z06 10.5" rear wheels. yes they bulge a bit but hook great! I had 335/18 Pilot sports on the wheels before and they DID NOT bulge. Also 305/18 nittos fit the stock Z06 wheels perfectly.
biggest tires on 01 c5? 
2bar 
T1 
