Originally Posted by
BobbyG
FWIW: On my old MTB-based commuter I added a flap cut from a flexible rubber yoga mat and attatched with nylon nuts and bolts. The original fender comes to within 4 or 5 inches of the ground, but still allowed water to spray my shoes and chain. The front flap I added comes to within an inch of the ground and keeps everything dry and clean.
mudflaps can also be crafted by cutting up a gallon milk jug, or a 2L soda bottle, a coroplast election sign, etc. BobbyG is right, you want the bottom of the front fender to be below the line between the bottom of the tire, and the bottom of your crank, in order to block water that wants to spray onto your feet.