I'm about to get a set of these wheels for the track--is the 6" size too narrow for a 205? I want to keep the weight down as much as possible. I'm getting Pole Position S03s which aren't the lightest but are excellent wet or dry.
I run 205-50 16s on 7". Works very well.
You would get more sidewall flex on a 6" rim compared to a 7". I wouldn't recommend it. Much depends on the contact patch of the tire but still I'd go with 7".
205 is kind of a minimum width for track work.