8/9/10/11 Speed 11T/12T/13T Freewheel Flywheel Pinion for Bicycle Bike MTB Cassette Cog In Mountainous Region and Highway

Specifications: Material: aluminum Color: silver Species: 8s 11T, 8s 12T, 8s 13T, 9s 11T, 9s 12T, 9s 13T, 10s 11T, 10s 12T, 10s 13T, 11s 11T, 11s 12T, 11s 13T (optional) Item size: 8s 11T / 9s 11T / 10s 11T / 11s 11T: 4.20 * 4.20 * 0.55cm / 1.65 * 1.65 * 0.22in 8s 12T / 9s 12T / 10s 12T / 11s 12T: 4.40 * 4.40 * 0.38cm / 1.73 * 1.73 * 0.15in 8s 13T / 9s 13T / 10s 13T / 11s 13T: 5.30 * 5.30 * 0.44cm / 2.09 * 2.09 * 0.17in Package List: 1 * Cassette cog