Originally Posted by speed21

I meant more in the context of how the steering and suspension behaved under track conditions. I imagine there would be a trade off given Porsche developed/rated the suspension using 20". Understandably the ride using 21's would be a bit harder along with more road noise penetration...but it would be the handling that would be my main concern. Are you aware of any comparison between 20 and 21 at the limit?...