A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights — or to charge batteries for electronic devices including cellphones or GPS receivers.
Named after their resemblance to bottles, these generators are also called sidewall dynamos because they operate using a roller placed on the sidewall of a bicycle tire. When the bicycle is in motion and the dynamo roller is engaged, electricity is generated as the tire spins the roller.
Two other dynamo systems used on bicycles are hub dynamos and bottom bracket dynamos.
Other articles related to "bottle dynamo, dynamos, bottle dynamos":
... Slippage In wet conditions, the roller on a bottle dynamo can slip against the surface of a tire, which interrupts or reduces the amount of electricity generated ... Hub dynamos do not need traction and are sealed from the elements ... Increased resistance Bottle dynamos typically create more drag than hub dynamos ...
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—William Butler Yeats (18651939)