Cube reaction hybrid hpa pro 500 e bikecubes reaction hybrid hpa pro 500 e bike is a genuine mountain bike that comes with additional power on hand to give you an exceptional riding experience this e bike successfully combines the characteristics of a performance hardtail with everyday realism thanks to the latest bosch drive technology a select range of premium components and an attentive frame design carefully placed batterycubes updated aluminium superlite frame has been built specifical