There are two things you can count on with steel frames: they ride like butter and you'll have to spend an inordinate amount of time hunting down a braze-on mount in order to attach any of today's front derailleurs to them. Shimano's Di2 derailleurs are a good case in point, but the Dura-Ace FD-R9150 Front Derailleur Adapter simplifies the hunt. It's an age-old solution to a contemporary problem. Frankly, Di2 front derailleurs are designed to be attached to carbon frames whose seat tubes have such tortured, overwrought shapes that no clamp known to human kind can tame them, so they're all just braze-on derailleurs that mount directly to the frame. This rules out frames with traditional, round, tube-shaped tubes--unless, that is, you've got the right adapter. The FD-R9150 Adapter lets you marry the latest drivetrain technology with your favorite frameset.

Actual Weight Notes: Weight is for 34.9 front der adapter. Manufacturer Warranty: 2 years. Recommended Use: cycling. Mount Type: clamp-on. Material: aluminum.

Mounting Type: Clamp-On Mount/Braze-On Mount. Case Material: Aluminum. Auto Part Position: Front. Color: Black. Brand: SHIMANO. Date First Available: October 13, 2016. Best Sellers Rank: #80,519 in Sports & Outdoors. Customer Reviews: 4.8 out of 5 stars 63 ratings 4.8 out of 5 stars. : B01M9AEDBG. Size: ?31.8mm/28.6mm. Part Number: ?ISMAD91MS. Manufacturer: ?Shimano. Number of Items: ?1. Color: ?Black. Brand Name: ?SHIMANO. Item Dimensions LxWxH: ?5 x 3 x 2 inches. Package Weight: ?0.04 Kilograms. Item Package Dimensions L x W x H: ?4.33 x 2.17 x 1.46 inches.