The only problem with plastic fenders is limited lifetime. The plastic will get brittle and crack. My SKS fenders cracked through after 4 years, with NO physical damage to the fender and NO significant Sun exposure, but I keep them together with tape right now.
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-=- '05 Jamis Nova -=- '04 Fuji Absolute -=- '94 Trek 820 -=- '77 Schwinn Scrambler 36/36 -=-
Friends don't let friends use brifters.