I've always ( been in it 1 year) cut my sipes with a grooving iron upside with a #4 blade and can make two cuts at a time.
I notice after a couple of races the sipes start to open up and almost look like they were cut with a #1 blade. Is this normal?. I run limited late model on 1300 or harder tire same as Supers. I see most of them cut thier tires with a heated siper that uses the knife blades because you can hardly tell they were cut unless you feel the tire. Is this something that makes a huge difference.
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