My math was based on a total width of 11" and 12" respectively.
I assumed the rims were known to be 10" and 11". If the rims are actually 9" and 10" the math will change but the outcome sould not due to an equal subtraction of 1" from both. However, 315s will not fit on a 10" rim.
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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)5369977 Service@MKExhaust Brian@RarlyL8
