Just riding along on a little bumpy chipseal road when hear something hit the ground. Not sure if I ran over something or something fell of the bike. Circled back and my light was on the ground in a few pieces. Could not find one of the batteries, but the rest seemed fine.

The light did not come of the bracket, rather the bracket broke in half. It was one of those 90 degree metal brackets that come with rear racks and attach to the rack with a screw.

I am guessing that over the year making small corrections to the direction of the light caused the bracket to bend at the same spot and eventually weaken and then break with a minor stress.

So my warning is to avoid bending the metal attachment bracket if you can. Will probably buy a rack that has the mounting bracket built in, as needed a new rack anyways.

Yeah - my experience in the "olden days" was that lights mounted directly to fork or frame - instead of the bars or luggage always broke eventually.

Bike frames and forks transmit shock, at least road bikes seem to.

If hit the home store or hardware store, then sell small SS washers with a rubber washer molded on the backside. I put one on each side of the rack tab and run a 5mm bolt through it to fasten the device. Use a nylock nut to do the job. This does a good just to suck up vibrations