Join Date: Feb 2006
Location: Near Mt. Vernon; just south of Alexandria, VA
In my carport, I use a simple ripstop plastic tarp that I loosely drape over the bike, so that the mirrors support it in front, and I tie it to the rear so it doesn't sag down onto the seat. Don't laugh..it works!
It is waterproof, and it does not breathe, but loosely draped, it lets air circulate and it does the job of keeping off the rain, dust, and sun.
Last year, I used a fitted, breathable, vented cover that used elastic to fit snugly around the pipes, and I had an unacceptable amount of minor pitting on the chrome and other parts. Apparently the snug fit elevated the humidity enough to accelerate the pitting, in spite of the fact the cover could breathe a bit and was vented near the mirrors.
So far, the cheapie plastic drape works fine...no pitting.
Of course, a drape would not work well if the bike were completely outdoors where the wind could whip it around.
Just an alternative, for those of you with partially-garaged bikes.