Originally Posted by K'Tesh

One thing that the OP left out of their post was the type of rack being used. This can have an effect on the choice of mount to use.

I only get racks that have a solid "deck" to prevent the stripe up the back when I have the fenders removed (which isn't all that often anymore).

I attach my PB Superflash (and/or PDW Dangerzone [they use the same mount design, and are interchangeable]) tail light's mount to a spare strut from another rack and mount the assembly to the underside of the deck with two bolts.



Rack in photo is a TransIt Pannier Seatpost Rack. I've used the same method with my newer PB Eco Racks.