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COMPATIBILITY: Designed for single speed BMX bicycles, folding bikes, and tricycles requiring 20-tooth freewheel replacement TOOTH COUNT: Features precisely machined 20 teeth for optimal gear ratio and smooth pedalling performance SINGLE SPEED DESIGN: Freewheel mechanism allows coasting whilst maintaining simple, reliable single-speed drivetrain operation REPLACEMENT PART: Direct replacement accessory for worn or damaged freewheels on compatible bicycle types CONSTRUCTION: Durable metal construction with threaded mounting system for secure attachment to rear wheel hub