Does anyone know what would cause this to happen to my pulley??
yeah, i've heard that from a few folks..Friction from the belt...
I was thinking about that but, i'm just going to replace it with a VMP pulley when i get back in Oct.If it bugs you, I'd powder coat it, it's more durable than paint. Also, I think i read somewhere there's a coating that has a rough texture to help prevent the belt from slipping as much.