From the ISSCA Autocross Rules page: http://www.goissca.org/ac_rules.htm
In the stock class only standard production DOT tires are allowed. “Special construction” or “Special compound” tires are not allowed in the Stock class. Tires can be of any size as fitted on stock size rims.
In the Prepared class only DOT labeled tires are allowed, including “special construction” or “special compound” tires. These tires include; BFG Comp T/A R, R1; Bridgestone Potenza RE71R, RE71RA, RE71RAZ, RE71S; General G; Goodyear S, GS-CS; Hoosier Autocrosser, Street TD; Kumho ECSTA 711R;
Tires can be of any size as fitted on stock rims.
In the Modified class any DOT labeled tire is allowed.
In the Race class any tire is allowed.<HR></BLOCKQUOTE>
"Drag Radials" are not included in the list of "special compound" or "special construction" on the webpage.
Do the experts believe these should count as "special compound" tires since, they are considerably sticker than your average street tire?