As the days are drawing shorter I bought a dynamo lights kit for the Yuba Mundo, and because of the large size of the tyres I needed the extension bracket so that the dynamo wheel meets up with the tyre correctly. Without it it touched at an angle, the top ridge of the dynamo cap wheel only, which would have carved a groove in the tyre eventually. Like this it makes contact with 100% of the driving surface of the dynamo wheel.
Up graded to this rear light which has a battery/capacitor inside that keeps the light onfor 3 minutes, which is good when you come to a junction at night for example. Still have to do the wires, as the wire that came with the kit is 6 foot long and isn't long enough !