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@erikjonsson
Done a fair bit of searching on here and on the google but I cant seem to find a reasonable solution for this. Wich im sure exists. I'm going touring alter this summer and I would much rather have my iphone on the bars doing strava and google maps than getting a cycle computer. But since the iphone4 batteries goes out in under 5 hours like this Im trying to find a charging solution. Something that is not a solar panel or a battery pack.
It seems there should be something fairly cool out that goes on the rim like a proper dynamo isn't hub dependant by now?