TX models come with Smart Cage which gives MegaRange compatibility with a shorter derailleur cage

• Smooth and confident shifting
• Light action shifting for stress-free long riding
• Double servo-panta mechanism
• Quick and easy assembly
• Pre-assembled inner cable fixing nut
• Cage Length: Long
• Chain Wrap Capacity (teeth): 43 teeth
• Drivetrain Speeds: 6, 7
• Largest Cog (teeth): 34
• Rear Der/Shifter Compatibility: Shimano Mountain
• Rear Derailleur Mount Type: Dropout Claw Hanger
• Color: Black