Plays in traffic
Join Date: May 2006
Location: Rochester, NY
Bikes: 1996 Litespeed Classic, 2006 Trek Portland, 2013 Ribble Winter/Audax
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It depends on how you're mounting it. Screwed to a standard reflector bracket, my CatEye LD-1000 has even survived a crash without falling off or falling apart. It got scraped up some, but otherwise it and its mounting are just fine. Same light mounted to its plastic QR seatpost mount flew out occassionally, which is why I screwed it to the reflector bracket on the rack.
I'm currently saving my pennies for a DiNotte taillight. it mounts the same way as their headlights, which for me, stay put really well.