Hi I do not have much experience with dynamo hubs but I did buy what appears to be a nice shimano one this summer to go with the Nexus 8 IGH hub. I haven't used it yet but it looks real nice.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk