I have a question regarding the finish of the rear triangle of my Ciocc San Christobal. I decided to polish the chromed front fork and rear triangle with some Simichrome. I finished polishing up the front fork and it looks great. I went to polish the rear triangle, and I noticed that the polish wasn't leaving the black residue its supposed to and the polish didn't do much. The rear triangle obviously has a different finish than the front fork. The fork takes polish nicely, almost as though it were aluminum (its not.) I rub the polish in and black resdue appears, I wipe off the residue, and buff to a shine. The rear triangle doesnt respond to the polish at all. I'm just curious if anyone knows what the difference in finish is. Thanks!