With an integrated chain stabilizer mechanism, the ULTEGRA RX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner.

• Chain Stabilizer mechanism adopted from MTB design
  
• Stabilizer ON/OFF switch
  
• Compatible with current road dual control lever
  
• Shadow RD technology
  
• Direct mount compatible
  
• Maximum cog size: 34t
  
• Total capacity: 39t