Thanks to Shimano's penchant for trickle-down technology, you can get Dura-Ace functionality at a more attractive price point. As long as you don't mind the slight weight differential you can count on Ultegra to serve up shifts that are every bit as clean, smooth and precise as those Dura-Ace delivers. For 2017, Shimano uses their shadow design, for a thinner assembly construction to offer a more streamlined, integrated fit. The pulley maintains consistent distance to the cassette for increased shift stability, and is compatible with a cassette up to 11-34T.Features: Shimano synchronized shift System communication with front derailleur Stable Shifting Performance Shimano Shadow Construction Low profile rear design Uses up to an 11-34T cassette

Low profile rear design. Shimano Shadow Construction. Stable Shifting Performance. System communication with front derailleur. Shimano synchronized shift.

Case Material: Aluminum. Capacity: 37 Teeth. Auto Part Position: Rear. Item Weight: 0.79 Pounds. Color: Gray. Brand: SHIMANO. Date First Available: June 9, 2017. Best Sellers Rank: #69,336 in Sports & Outdoors. Customer Reviews: 4.9 out of 5 stars 45 ratings 4.9 out of 5 stars. : B0721CRL1G. Sport Type: ?Cycling. Size: ?LONG. Part Number: ?IRDR8050GS. Manufacturer: ?Shimano. Number of Items: ?1. Color: ?Gray. Brand Name: ?SHIMANO. Item Weight: ?0.79 Pounds. Item Dimensions LxWxH: ?6 x 5 x 4 inches. Package Weight: ?0.36 Kilograms. Item Package Dimensions L x W x H: ?5.91 x 4.72 x 3.74 inches.