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RarlyL8 RarlyL8 is offline
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
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315/30-18 is a given IMHO.

275/40-17 on a 10" rim = -0.1" of pucker, your tire is streched on that rim.
315/30-18 on an 11" rim = +0.2" of pucker, tire is not streched.
Difference = 0.3"
Current spacing = 1 1/8"
Same offset with new wheels = 1 1/4", add current spacing = 2 3/8"
Subtract for new tire pucker = 2 2/25"
2" spacers should put you back to where you are now - just like you said in the original post.
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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 01-13-2008, 01:21 PM
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