Tried the 36r here on our track in Florida they don't seem to work every well they are a nice tire but don't hold the the grip on a treated or untreated asphalt outdoor track i don't like using sauce. .they do ok for about 10 to 15 laps after thatit's like being on ice i run 21.5 tc. And how can tell when the tire is done and not any good or use up ready for trash can? Thanks