Bicicleta na parede.
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Numa Bicicleta... Liberdade!
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Cogs, clinchers, and more—demystified. Here's a quick guide to bike parts, repair, and lingo.
Neat visual showing where your body uses which leg muscles on a bike
8 WEEK BEGINNER 30KM CYCLING TRAINING PLAN
Another option of a power source would be bike powered. The picture above shows how this would work. The wheel would spin and the chain would move this would cause the motor to charge.