S1R can be done in any offset, so S1R will have the best offset.
S13P has some great offset selection for 370Z as well.
S13P - 19x9.5 O disk weight in at ~ 27 lbs per wheel
S1R - 19x10 O disk weight in at ~ 25.5 lbs per wheel
So the S1R are a little lighter.
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