Originally Posted by
Bandera
Sandpaper? In the plethora of bicycle maintenance mis-information that ranks right up there with carrying spare pedals on tour......
-Bandera
Disagree.
The dark gray dust on everything around the rim is Aluminum Oxide. And Aluminum Oxide becomes a heavy layer on your brake pads. Aluminum Oxide is much harder material than the Aluminum alloy in the rims, in fact Aluminum Oxide is used in grinding wheels and cutting tools to cut steel.
Rims cost more than brake pads. I would rather periodically remove the Aluminum Oxide from my brake pads than replace my rims.