I've been looking at some sort of dynamo system for my brompton. My goal is to basically use it to charge my phone or a gps, but would probably add lighting eventually. I've read a good deal on both systems, but get equal pros from each. I can get the shimano dynamo wheel for $160 and a bottle dynamo by Axa for $39...then the expense of the charger/lighting.
What I like about the bottle dynamo is that I can completely disengage it when not in use. The previous brompton dynamo was a Axa bottle dynamo and people had nothing but problems. But, I'm wondering if its bromptons choice of attaching it to the bike, smaller wheels, or user error.
Anybody have experience with either?