一體式七速飛輪 （Unbody 7-Speed Cassette）

• 一體成型設計，剛性高、傳動穩定不鬆動
• 經熱處理強化結構，耐磨又耐用
• 寬齒比配置，適合爬坡與城市通勤

• Integrated one-piece design enhances rigidity and drivetrain stability
• Heat-treated construction increases wear resistance and durability
• Wider gear range ideal for climbing and urban commuting