Mountain Bike Lighting Systems: This high light output option is best for off-road riders or riding on county roads with no additional light source like street lamps. Lighting systems come with rechargeable, high capacity batteries, allowing for long run-times and good battery life. Weight is typically greater than safety or commuter models, though some race specific lighting systems are surprisingly lightweight. They must be combined with a taillight for safe road riding.
Learn More: http://learn.performancebike.com/bikes/advice/buyers-guides/lights-and-accessories/basic-guide-to-bike-lights
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