Racing slick labels

[3rd_gear_Ted]

From my 1st track season on slicks with my older 911. (A whole other story), I got a question about labeling On various manufacturers of racing slicks, there are some red or yellow bar code labels on the sidewalls. Some slicks I've seen even have both labels being yellow or vice versa in red. What do these red or yellow colored labels designate to the user or a tire shop mechanic if anything???

[stownsen914]

Not sure if this is the labeling you are referring to, but Goodyear puts a yellow stamp (might be an X, but I don't recall for sure) on the sidewalls of their racing slicks to signify directionality for mounting. The X faces left on front tires, and right on rears.