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I've used a standard SON dynohub for years for Audaxing and they work great. Never noticed the extra drag.
While SONs were the go-to for years, LEDs have changed the formula. A number of new generation dynamos are making the choice more difficult. One of the coolest, I think, is the Velogical: tiny, rim powered, weighing only 75g and 70% efficient. Some long distance riders are combining these with strorage/USB chargers--- running their lights off the batteries being charged by the dynamo rather than directly powered. A popular open source/community DIY project is the German Forumslader: http://www.forumsloader.org (unfortunately only in German). The Velogical runs 150 EURO--- they even make a variant optimized for something like the Forumslader instead of lights--- and the cost to built a Forumslader will probably be between 70 and 150 Euro (using one of the kits). For standard Audaxing a lot of overkill but for....
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EdwardZ
@Greenbank
My plan for future long distance rides (if I go back to Audaxing once MiniGB is a bit older) is to get something like the "B&M Luxos iq2 u" front light as:-
a) It throws out a metric shitload of light (I used to use Solidlights XB2 before they got nicked) in a nicely shaped beam that won't dazzle other road users
b) it (the light itself) contains a small cache battery
c) it also provides a USB port for charging other stuff (I'd have a PortaPow battery pack in a tri bag behind the stem, or use it to power my Edge 705 GPS whilst riding)
I've used a standard SON dynohub for years for Audaxing and they work great. Never noticed the extra drag.