Prevent the chain from falling to the back of the flywheel and reduce the sediment on the flywheel.
Easy to install and convenient to use. Nice accessory for your mountain bike.
It is only suitable for Disc Brake Cassette Hubs.
It is made of premium transparent plastic, good toughness and not easy to crack or damage.
Four claws design can firmly fix the hub, and the hub is not easy to fall off.