The Dura-Ace R9150 rear derailleur takes Shadow technology from Shimano’s MTB range and introduces it to the road.
Top Features of the Shimano Dura Ace Di2 R9150 E-tube Shadow Rear Derailleur
- Maximum Sprocket: 30T
- Minimum Sprocket: 11T
- Maximum Front Difference: 16T
- Total Capacity: 35T
- Ergonomic shifting operation without stress
- Shimano synchronised shift
- Low profile rear derailleur design
- Shimano Shadow RD
- Race endurance for less damage in crash
- Maintains compact and smooth appearance
- Weight: 204g
The Shadow design offers faster wheel changes thanks to the fact that it moves the derailleur out of the way of the dropouts. It also offers faster and more precise shifting than ever before.
Shimano’s 9150 groupset brings their Syncro-Shift technology to the road too. Syncro-Shift technology enables the front derailleur to read the position of the rear derailleur and will automatically operate the front shift to position the gears in the most efficient gear and best chain line so you’ll never have to worry about front shifting and correction shifts again.
The shadow design places the rear derailleur under the chainstay and cassette to give a slimmer profile, which not only improves aerodynamics but helps prevent damage in a crash.
About Rear Derailleurs
Various derailleur systems were designed and built as far back as the late 1800s. A French bicycle tourist, writer and cycling promoter Paul De Vivie (1853-1930), invented a two speed rear derailleur in 1905 which he used on forays into the Alps, and we wonder if 20 gears are enough….. Since then there have been many advancements, in the number of gears, materials and reductions in weight. Wiggle lists a large selection of front and rear derailleurs catering for double and triple systems with 7, 8, 9, 10 and even 11 speed cassettes.
About the Shimano brand
Shimano are the makers of the world’s most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro’s, Dura-Ace and XTR, which cover both road and MTB’s. At Shimano, they’re doing everything they can to respond to heightened environmental concerns. Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.