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Shimano FFS Front Freewheel 52 & 39 Teeth Sprocket & Crank Schwinn 10 speed | eBay
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Intend adds a freewheel to their cranks, letting you shift without pedaling - Bikerumor
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How to remove old Shimano FFS crank? - Bike Forums
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Shimano FF System 14-28 5 Speed Freewheel - Gringineer Cycles
