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

Features: The surface is waterproofing. Compatible with Shimano mid or long cage derailleur. Suitable for highway or mountains. The shape of cogs are specially designed for shifting performances. Made of fine material. Discounted at only: US$ 5.9