OEM sizes are:
16" used 205/225 on 6 and 7" widths, front and rear respectively
17" used 205/255 on 7 and 8.5" widths, front and rear respectively
18" used 225/265 on 7.5 and 9" widths, front and rear respectively
As mentioned, the reason folks run 225 on the fronts (17") is to reduce understeer.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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