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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,148
It depends upon the tire manufacturer. Track tires tend to run big so it may be a problem. My street Pirelli's run small and the 315/18's I have actually measure closer to 300mm. I have seen bigger 295's.
A more precise question would include the manufacturer that folks are using.
If staying with Hoosier then you can likely estimate the real-world size of 335's based on your 315's.

315/30-18 = 12.4w x 25.4T
335/30-18 = 13.2w x 25.9T

You will gain ~0.8" (6.5% increase) width and ~0.5" (2% increase) in height. That's a lot for stock 930 fenders.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 01-18-2009, 04:56 AM
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