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I had one my Straggler (primarily for USB charging on tour) and it was great for flat or road riding but as soon as things got steep or unpaved it wasn't generating enough power to be much use. I love the convenience of dynamo lights but for me the payoff isn't worth the cost or complication.
Rechargeable lights, USB power banks and small solar panels have made a dynamos redundant for my use case.
Why no dynamo?
Project is very cool :)