The specialized sirrus elite hybrid bike 2017 has been designed to help you along the path to fitness and health featuring a durable light weight aluminium frame and a fact carbon fibre fork for a supremely efficient ride the frame itself has been made from an e5 premium aluminium complete with a fitness geometry that keeps things comfortable particularly over longer distances zertz inserts in the fork help abosrb road vibrations to create a smoother and more compliant ride complete