Surron light bee how to change your primary drive belt, the belt is a quality German brand continental, but if it gets a lot of debris inside ie heavy sand use or went mud it can cause a snapped belt. In extreme use we recommend an upgrade to the primary chain and sprocket kit costs around £100 , noiser than the belt but will cope with extreme use better and pro riders see www.surronbikes.com for new belts and upgrade kit, we will also have in stock shortly the correct socket tool for the swing arm bolt