This post is for the flipside of the winter tires in summer thread. If a Roadster with summer tires (AD07 front, AD08 rear) happens to get caught in a little snow (for example, the roads might have been clear the night before but there was an unexpected light snowstorm overnight), how well does it do?
I had this happen once this past winter. It was very cold out and the roads had not been treated. I ran out for an errand on a clear afternoon. While I was gone, a dusting of snow came in...and the car was practically undriveable! It was all over the road. Doing under 5 MPH, I could feel the back end just sliding all over the place. Scary stuff.
This happened to me with the hankooks ( front and rear ). The car behaved perfectly. Light snow fall, white tarmac, highway. I did drive carefully, but at normal speed.
I once took the Roadster out briefly on AD07's in some fresh snow, just to see how well it drove. I was amazed - pretty good. Of course it is not uncommon for Roadster owners to be surprised at how little rear tread they have left... If you didn't have much left then you'd be all over the place.