Compatibility: Converts a multi-speed hub to a single-speed wheel. Works with all Shimano or SRAM 7 to 11 speed cassette-type hub bodies, for both mountain and road bikes. Note: This product does not convert the hub into a fixed gear; the hub remains a freewheel type. High-quality stainless steel: The sprocket is constructed from high-resistant stainless steel with strength and hardness twice that of standard 316 stainless steel, achieving a hardness of 18 degrees. Chain compatibility: Designed for chain widths ranging from 1/2" x 3/32" to 1/2" x 11/128", compatible with 7-speed to 11-speed chains. Allows use of your original chain. Available in multiple tooth options to achieve the ideal gear ratio. Specifications: Material: Stainless steel Color: Silver Teeth options: 12T, 13T, 14T, 15T, 16T (optional) Processing technology: CNC cutting Packing dimensions: Approximately 12 x 8 x 2 cm (4.72 x 3.15 x 0.79 in) Application: Converts multi-speed mountain or road bike hubs to single speed, compatible with 7/8/9/10/11-speed chains Package includes: 1 x Single-Speed Bike Freewheel Note: No retail packaging included. Please note: Allow 0–1 cm variation due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the actual product color may vary slightly from images shown.