Recently I have been testing some new slip-on silicone HO tires. The goal with these tires is to match or exceed the performance that you get with silicone coated sponge tires. Silicone coated sponge tires have been the best performing HO tires for a long time, but they are expensive, they can have a short life, you must pull off the wheels and press on new ones to change tire diameters and a number of makers have dropped out of the picture so that type of tire has become more difficult to find. I believe that a number of clubs have switched over to running slip-on silicone tires for those reasons.
So what if someone could make a slip on tire with the same characteristics as a silicone on sponge tire, but was not as time consuming to make and thus would probably be less expensive. Having a more durable tire that could be changed without also having to change the wheels would be an added bonus.
Thus far the results of testing on my MaxTrax have been encouraging. The tires are 0.340 inches in diameter when they are on a 0.170 inch diameter wheel, for me that has been about the optimum size to use on a T-Jet SS or Fray type car.