Cycling enthusiasts and bike mechanics, this Shimano SF-1200 freewheel is the genuine replacement part you need for your bicycle repairs and maintenance. With a 1/2 x 1/8 inch thread size and 20-tooth configuration, this freewheel cog is built to Shimano's renowned quality standards. The precise engineering ensures smooth engagement and reliable performance mile after mile. Whether you're replacing a worn-out freewheel on an older bike or building up a new project, this component delivers the durability and precision Shimano is famous for. The 20-tooth count provides a good balance between climbing ability and speed maintenance, making it versatile for various riding styles. Installation is straightforward for anyone with basic bike maintenance skills, and once installed, you can count on consistent performance. As part number I-SF120020, you know you're getting an authentic Shimano product rather than a questionable knockoff. Perfect for vintage bike restorations, commuter bike maintenance, or general bicycle repairs. If you appreciate quality components that last and perform as expected, this Shimano freewheel won't disappoint. It's one of those fundamental bike parts that every serious cyclist or mechanic should have in their spare parts collection for when maintenance needs arise.