Am trying to find decent dynamo powered rear lights that does not involve the use of a rack, would like to retain flexibility with carrying stuff using Bagmans and various Carradices, and just seems a pity not to run a dynamo powered rear light.
Not a very good photo of the light, but here's a B&M toplight line plus on my Roubaix (photo taken on the return leg of PBP)
![](http://farm7.staticflickr.com/6194/6128857870_e99d0b5fb0.jpg)
The light is mounted by two strips of aluminium, which are bent around the bagman frame then drilled and bolted to clamp them tight onto the bagman frame (like a pair of P clips, not drilling or bolting them directly to the bagman at all), and the ends are bent at 90 degrees then drilled to allow the toplight to bolt to them.
The power cable is taped to the underneath the bagman frame, running up to the saddle then down the back of the seatpost, then taped underneath the top tube to get to the front of the bike. I keep meaning to cut the cable under the saddle and put a connector in there to allow quick removal of the bagman without needing to remove the cable.
The only problem with this setup is that a heavily loaded bag can bounce enough on the bagman to cause the light to hit the mudguard.
You may notice that the light on the seatpost is obscured by the bag - that's actually just a storage position for it when the bike is in this configuration; there is a Hebe mount on the bagman between the dynamo light's aluminium clamp strips , but I tend to keep the battery light on the seatpost as it is only for backup use and is less likely to be knocked and damaged there.
If you are interested, I'll take a close up photo of the clamping arrangement tomorrow in the light.