Advantages Over Hub Dynamos
- No extra resistance when disengaged: When engaged, a dynamo requires the bicycle rider to exert more effort to maintain a given speed than would otherwise be necessary when the dynamo is not present or disengaged. Bottle dynamos can be completely disengaged when they are not in use, whereas a hub dynamo will always have added drag (though it may be so low as to be irrelevant or unnoticeable to the rider, and it is reduced significantly when lights are not being powered by the hub).
- Easy retrofitting: A bottle dynamo may be more feasible than a hub dynamo to add to an existing bicycle, as it does not require a replacement or rebuilt wheel.
- Price: A bottle dynamo is generally cheaper than a hub dynamo, but not always.
Read more about this topic: Bottle Dynamo
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