Porsche recommends 225's for the fronts 
tire size
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Racer
Joined: Aug 2004
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From: manitoba, canada
tire size
I got a set of cup rims from a 1995 996. The rears are 9 inches and the front are 7 inches. What size tires should I get for them? I was thinking either 215 or 225 for the front and 245 or 255 for the back. Should I go with the 45 or 50 profile? I know the 50 fills the wheel well a little more (height wise). Which way should I go?? 
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From: Tampa, Florida
If they are 17s, 225/45-17 front (215 is for a rear engine car) and 255/40 or 265/40-17 rear
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Originally Posted by 928fan4life
will 225 fit on a 7 inch rim? These are 17 inch rims. Is 40 to low of a profile? Does it leave to much of a space between the tire and the car??
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From: Nova Scotia
Originally Posted by 928fan4life
Garht - what do you mean by the +1 concept?
Sorry to confuse: the approach of increasing wheel diameter 1" and simultaneously decreasing the tire aspect ratio one division will result in ~ same overall diameter - often cited as "Plus 1"
eg., 225/50 R16 to 225/45R17 to 225/40R18 can be considered 0 to +1 to +2. These tires fall within ~0.3" in overall diameter, matching the speedo gearing and fit for the car while the wheel diameter increases - at the decrease of aspect ratio ( tire sidewall height).
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From: Mountains of GA!
Originally Posted by 928fan4life
thanks very much! Makes sense.
Do you think 265 or 275 would fit on a 9 inch rim?
Do you think 265 or 275 would fit on a 9 inch rim?
It'll show you the recommended rim widths for various tire sizes.
i.e. - for the YOKO AVS-ES100's, you can go as large as a 275/40-17 on a 9"
The "OPTIMUM" (as DR said - damn guy - he's ALWAYS right!) for a 9" is a 255/40-17
Going as large as a 275 could be difficult - depending on how flexible the sidewalls are - for mounting purposes.
