When building my René Herse randonneur bike, I was unable to find a taillight that combined the functions I needed along with a classic appearance. I ended up making my own taillight. Now this light is available from Compass Bicycles Ltd.
I wanted a generator-powered taillight that matched the appearance and style of a classic, hand-built custom bicycle. The plastic tailights from Europe did not meet that criteria and were not appealing. I also wanted the light to incorporate a reflector, both as a fail-safe and to comply with legal requirements and the rules of randonneuring events.
I wanted reliable internals, and not custom-made electronics. The light had to survive many years of spirited riding on rough roads. It also had to be lightweight.
Bicycle Quarterly contributor Hahn Rossman suggested using the reflector as the lens of the taillight, which creates a nice, diffuse light. This reduces the glare for riders following you closely, yet it is no less visible from a distance. (The reflector doesn’t reflect the other way, so it doesn’t absorb more light than a normal red taillight lens.)
The Compass taillight has a machined aluminum housing. The reflector is EN-approved. (We tested a number of reflectors and used the one that reflected best, while also being thin enough to work as a taillight lens.)
Inside the aluminum housing are the electronics and LED of the Busch & Müller Seculite Plus taillight, which include a standlight. The circuit board mounts to a custom-made stainless steel plate, so it is securely attached. The stainless plate also serves as an attachment for the grounding wire.
The light comes with a custom-machined, two-piece braze-on. Your framebuilder can attach this behind the seat tube of your bike, René Herse-style. The screw-in piece provides a conduit into the seat tube, so the wire doesn’t snag on the sharp edge. It also provides a stop for a seatpost that otherwise might be inserted too deep and cut the wire.
The braze-on is pre-mitered for the seat tube, but your builder also can braze it to the end of a tube, if you want to use the light on a rack. You could also mount it underneath the chainstay, Alex Singer-style.
The light comes with ample wire to reach the headlight. The wire itself is a special automotive wire. The insulation is made of a cross-linked polymer with extra-high abrasion resistance.
The Compass taillight carries a 2-year warranty. It is made in the USA, and available now. More information about the Compass taillight is here.