Proline has a tire called (I think) Bow Tie which was recommanded by the Cat Store.... Last time I went they were out of stock and they suggest me to check with Hung Sing which they have them... use their tire inserts as well.....
But I wouldn't use them in TKO as the Prolines are much softer for hard surface (TRC) but TKO is loose gravel... I will stay with Tamiya nail tires for TKO and Proline for TRC.........
Will try out the performance of the Prolines tomorrow...