That has been a common tire setup for years. Especially for indoor high bite smooth tracks. It worked very well. It lowered the center of gravity and gave less tire deflection while cornering and because of the smaller diameter it gave a little better acceleration. They were a big advantage to the select few that could mount them properly. Recently most tracks have not allowed them anymore, I know this to be true for 1/8 buggies but I am not sure about 1/10 truck. I think the reason was that most racers that were new to the hobby or racers that showed up to a new track and did not have them in there pit box were at a disadvantage, that and the fact that once you did this to your tires they were pretty much only good for one particular track. So for some it was a money issue.