The Cube Reaction Hybrid Pro 500 is a super fun hardtail, electric cross-country mountain bike. The Cube Reaction Hybrid Pro 500&';s PowerTube frame design is so sleek, you&';ll barely notice the high-capacity Bosch battery and sophisticated, Smart System Bosch CX motor. But you&';ll definitely recognize the power. Cube Reaction Hybrid Pro 500&';s internally routed cables reduce maintenance and help keep gear shifts clean and precise.