Check out also VP Pro:
http://www.redrc.net/2008/08/vp-pro-...re/#more-11121
Chris, so the 1:8 cars wouldn't be faster with wider rear tires?
How's your regulations as to max width? We had no limit in Norway, so we sat a limit when VP Pro came out with these. Too keep it simple for all drivers and keep the current tires/wheels.
My guess still is that it would be an improvement as to performance...