Shimano GRX Di2 RD-RX817 11S rear derailleur
Shimano GRX Di2 RD-RX817 11S rear derailleur
With an integrated chain stabilizer mechanism, the SHIMANO GRX 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. The RD-RX817 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with mtb cassettes with a 42T low sprocket max.
Features
- Silent and uninterrupted rear shifting on rough terrain.
- Adjustable chain stabilizer prevents chain slapping and drops.
- Smooth and reliable mixed surface shifting.
- Switch stabilizer ON/OFF to match the terrain.
- Gravel-tuned clutch tension.
- Compatible with road Dual Control Lever.
- Bottom sprocket: Max. 42T/Min. 40T.
- Upper sprocket: Max. 11T/Min. 11T.
- Pulleys: 11T.
- Real weight: 321 g.
Technologies
Shimano Shadow RD+
Less distraction quiet drive train now is real! Rear derailleur stabilizer Shadow RD+ reduces chain slap and save you from chain drop. Lighter and more efficient than roller type chain device!
Seis Shimano Electronic Intelligent System
The SEIS innovative shift technology is still based on the SHIMANO INDEX SYSTEM (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics. This electronic shifting system has been extensively tested over past two years by several professional riders in all conditions possible, such as rain, mud, low temperatures, cobble stone roads and combinations of all of these at the same time. Shifting is executed by simply pressing the button. No power is needed to shift, which gives important advantages since it is easier now to always keep a tight grip on the handlebar and to keep your concentration on riding instead on shifting. The shift system allows accurate and effortless shifting in difficult circumstances for example when you have cold hands or when you are completely exhausted. Furthermore, the shifting performance will never be affected by contaminated or stretched cables since the shifting signal is transferred electronically. The operating buttons work similarly to mechanical DUAL CONTROL LEVER so you don’t need to re-program your mind for the SEIS.