I don't know the size yet, I've sent an email requesting more info.
That photo is from a recent cross-country trip (
http://carbiketrip.blogspot.com), from a great ride starting at the campground at Devil's Tower.
There are easier ways to deal with rust, unless you're in a seaside community.
I am about 300 yds from the pacific ocean. Everything here either rusts or molds (or both).