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i don't know the specific weights, but generally speaking (especially with stock Porsche rims) the bigger the rim, the heavier. so 15 will be lighter than 16 and so on. this of course varies with material (alloy vs. steel) and production technicque (forged vs. 3-piece).
then you have the trade offs with sidewall height and flex on smaller rims and harsher ride and different (arguable as to whether better or not within the spectrum of sizes) handling characteristics.
16's should be a happy medium if you are looking for a little bit of all worlds.
you may have already known all this, but seeing as i don't know the specifics, i thought i would share what i could. fwiw, i am running 17's and have a spare set of 16's that i may use for autocross or put on my 944T.
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