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Gear advantage.
It is assumed (sometimes incorrectly) that if you go up a size in wheel diameter that you also increase rollout circumferance. If that is the case then you loose a gearing advantage.
You also loose top end and accelleration with the increase of unsprung weight.
What size meats you got on those 12x18s?
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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
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