The ST Siper can sipe any tire from 12” to 24.5” with the adapters available. It’s easy too: operators can be trained in 15 minutes. Its fast: the process takes only 3 to 4 minutes per tire to perform. Any type of tire can be siped – new, re-cap, or used – as long as it has 5/32” of tread left. Twelve cutting blades are furnished with the ST, along with four lead screws for siping depths of 5/32”, 7/32”, 9/32” and 11/32”, a file, and a wrench for switching lead screws.