It depends on which RX-7 you are referring to. RX-7s were made from 79-85 with a lot of different wheels. My 95 MX-6 LS and 91 RX-7 have the same size wheels on them and are probably similar in weight; the spokes are about the same size. However, for the 3rd gen RX-7, they are 16" (I think) with thinner spokes.
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