RTR/RTA/RTF will not exist next year, and instead will be replaced with Street versions of each stock class. For 2014, the minimum treadware for Street will be 140. From 2015 on it will 200.
For 2014 only, the Stock classes will stick around, and I believe their class lettering will be ?SR (? is S,A,B,etc..), where the R I guess stands for "Racing" tires I guess.
The new Street classes will be run alongside the Stock classes, and their class lettering will be ?S. There will be two separate "Appendix A"s (the section of the rules that says which cars are in which class), one for Stock and one for Street. Starting in 2015, all ?SR classes other than SSR will be done away with leaving only the ?S classes and SSR.
The most recent version of the full Street class rules can be found in the June Fastrack: http://scca.cdn.racersites.com/prod/ass ... e-solo.pdf" onclick="window.open(this.href);return false;
The most recent version* of the Street Appendix A can be found in the August Fastrack: http://scca.cdn.racersites.com/prod/ass ... g-solo.pdf" onclick="window.open(this.href);return false;
The changes in rules between Stock and Street can be found in the June Fastrack, but they're mostly the same, with the following two key differences:
- ±1" diameter (from stock) wheels may be used. You must still use the same width as stock, and the offset rules are the same.
- There's an allowance to "defeat" any traction control or stability systems that don't come with a factory method of disabling them
Hope that helps!