- Bottle dynamos may be noisy, can slip when wet, and may wear the sidewall of the tire
- No lighting available when stopping when equipped without standlights
- Limited power output
- Cut out at very low speeds (below walking pace) (modern dynamos often add capacitors to keep the lights going for a short while when the bike slows or stops, or in-line rechargeable batteries for long-time use of unused real-time energy)
- Difficult to remove by the owner to thwart theft or vandalism
- Cheap or poorly aligned dynamos produce noticeable drag
- Halogen bulbs run by a dynamo have a relatively short life (around 100 hours) (modern dynamos tend to not suffer from this problem)
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