Feature: 1. FAST: The high performance design of folding bike single speed flywheel provides fast riding speed while saving effort, so you can ride comfortably.2. SMOOTH TURNING ACTION: Folding bike single speed flywheel has smooth turning action without much noise, 90 click, 10mm or 0.39in hole diameter. 3. ALUMINUM ALLOY AND STEEL: Our folding bike single speed flywheel is made of excellent aluminum alloy and steel, which is strong, corrosion resistance and durable. 4. HIGH ACCURACY: The bike 9T flywheel freewheel has high accuracy thread machining to ensure a tight connection with the bike hub and smooth running. 5. TWO BEARINGS: Our folding bike single speed flywheel has two bearings for M35x1.25‑30 tooth ring. Practical and robust. Specification: Item Type: Folding Bike Flywheel Package List: 1 x Folding Bike Flywheel1 x Socket |