PRODUCT FEATURES 【CASEMIOL ROAD BIKES】 -700C Hybrid bike / Road bike speed and hybrid bike versatility. 【24 SPEED OPTIONS】- Shimano's 24-speed (3*8 gears) change system provides a stable speed change experience. 【HIGH QUALITY ACCESSORIES】-Aluminum rims, TEC chain, and CHAOYANG 700*25C High-performance tires, good riding experience. 【EASY TO INSTALL】-85% pre-assembled, easy to assemble, free installation tools and pedals included. 【DUAL BRAKE DESIGN】-Front and Rear Disc brakes, double brakes safer and faster braking response. PRODUCT DETAILS Bike Type: Road Bike, Hybrid Bike Age Range (Description): Adult Number of Speed: 24 Speed Color: White Wheel Size: 700C Frame Material: Aluminum Alloy Frame Suspension Type: Rigid Frame Size: 21-inch Frame Special Feature: Lightweight