Rear Fender/Mudguard Length and Shortening
I'm thinking about trimming my rear fender down. The only advantage of a long rear fender or adding a mud-flap to it is to benefit people who are riding behind you. When riding around town, I'm mostly riding alone, especially when it's raining. Plus, I'm getting ready for a long-distance, self-supported ride next year (over 2000 miles in 2 weeks, the Transcontinental Race) for which I want to trim off all the weight I can while still having full fenders; and drafting isn't allowed in that event, so there shouldn't be anyone on my wheel.
So, how far do you think I can go with fender trimming if my goal is purely to keep myself dry? It's currently about level with the axle and has no mud flap. Of course I can start experimenting easily enough, but does anyone have some useful advice/experience?