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Gearing change from 16"-17" Wheels
What type of gearing change might there be from a 16" wheel (7" and 9" widths) up to a 17" wheel (8" and 9 1/2" widths) on a stock 1988 911?
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'88 911 - Stock....sans suspension upgrades |
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08-01-2010, 03:57 PM
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
Posts: 29,522
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What defines the gearing change is the change in circumference of the tires between the two set-ups. What tires are you planning on? What do you have now?
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Jim R. |
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08-01-2010, 04:00 PM
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I'm running 17" 8s and 9 1/2s with 235-40 and 255-40...
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'88 911 - Stock....sans suspension upgrades |
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08-01-2010, 04:10 PM
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
Posts: 29,522
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Since you didn't list your original tire sizes, I assumed that they were the same height as the standard tires listed in the Porsche 911 Red Book. If my math is correct, your gearing should be approximately 1% taller with the 17's and tires you have.
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Jim R. |
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08-01-2010, 04:22 PM
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MBruns for President
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Not enough for you to notice. Depending on tires and their weight - and being the rotating mass is more (bigger wheels) you will notice that more than the gearing change.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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08-01-2010, 05:34 PM
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Gone to California
Turbo
