New Traction tires special made to exact specs of the tire used on the MU2 Mantua Tyco Motors. These are the round ring like the original. They have been tested by me on my own layout. These run true and seem stickier than the originals yet hold up nicely. These are not some hand fabricated rings like some others listed. These seem to hold up well with over 100 hours pulling 10 weighted cars with metal wheels and still appear to be good. Try yours today.  Thanks for looking.