i know what you mean, the standard C wheel has a nice feel to it. the Porsche wheels have a quite angular profile when compared to the roundness of the C wheel, but they are still quite substantial. the bumps on the rear of the wheel are a lot more pronounced on the Porsche too, so it still has a good feel. worth checking out the 928/944 wheels if you can, but i think they're similar to the RS wheel in diameter if they're any smaller than the stock wheel at all. later porsches have smaller wheels, but most from 1992/3 onwards have airbags. the trouble with smaller wheels in the 964 era 911 is that because the rev counter in in the center with 2 dial either side of it, your hands obscure most of the dials (including the speedo and all the warning lights!) when you're driving.