I have a 50T on my 450 and I have been extremely happy with the durability and wear on it. About a week ago I had to leave the track quickly without doing my usual routine of power washing the bike and drying/lubing the chain before leaving. It did rain a little at the end of the day, not like Unadilla this year (if you were there you know what I'm talking about ), just a few showers. I couldn't do the clean up on the bike for a few days, due to more rain, so I left the bike in the trailer. When I finally got around to it I noticed that my DID 520MX is now toast (totally rusted) and the Ironman sprocket with very little signs of wear is also rusty. Am I being silly that I think I can break out the Dremel and buff the rust off or should I just get another sprocket when I order my new chain?? Thanks.