The Planet Grunge Board is a the choice if you are looking for low cost protection from spray, mud and crud up front.
Works on bikes that for one reason or another cannot have other fender types installed.
The downtube mounted fender has a 3 inch width and quickly secures to your bike with the two-point rubber strapping system.
The downside with this type of mudguard is that it only works when the front wheel is positioned straight ahead. As soon as you turn the handlebars off center your feet will be sprayed.