This will make your front tire last when you have no money and a big race soon. Take a drill bit that is just a little smaller than the nob and drill every other nob. This will make the tire clean and grip like new. But don't drill too deep. It wont take much at all; just a little nip of the tire (about 1/4" deep). This took me like 2 hour, but was worth it. The tire lasted me 4 races with 2 days of practice between them.