Zefal makes a pretty good clip-on type fender. and there are other companies that make them as well. i have a zefal that just clips on to my seatpost, it's very secure and seems to do the job just fine. the only problem is that my shoes frequently get soaked my the water from my front wheel...thos zip-tie kind that attach to the down tube don't really do the trick though, cause they don't move with the wheel...and it's the turning that get's ya.