Bicycle
A fixed-gear bicycle is a bicycle without a one-way free wheel, and the wheel and the pedal are always in linkage.
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NO.1 broken wind knife ring: fixed firmly, no worries NO.2 crank - sprocket wheel: five claw sprocket wheel, stable, safe, beautiful NO.3 seat: simple and generous, comfortable riding NO.4 flywheel: reverse brake flywheel, safe and durable
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