Re: super stealth bike
Paint your bike like a zebra?
Really, the best stealth bike I have seen is BarelyAWake's suggestion: Paul's mountain Pie.
It is really hard to hide a gasoline engine in an open frame bicycle. Some folks have tried tin boxes, milk crates, paniers (saddle bags), home made fairings similar to modern sport motorcycles, but you just can't hide the exhaust noise.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."