What is story behind the bell on the motorcycles?

Friends and family of a rider, buy a bell and give them as a gift.

The rider tries to hang the bell from his motorcycle as close to the road as possible but out of harms way. It is believed the bell scares away gremlins that would sabotage the riders bike. It's just a good luck charm.

A rider isn't supposed to buy their own bell but receive it from a fellow rider (is best) or friends and family.