The Record 12-Speed rear derailleur has an innovative shape that envelopes the cassette better, thanks to 3D Embrace technology, creating a double effect: allowing the chain to maintain optimum traction at all times, thus increasing the speed, power and precision of shifting. Optimized to work with cassettes from 11 to 34 teeth. Carbon fiber-reinforced construction, to increase strength while keeping weight to a minimum. 12-tooth pulley wheels for smoother chain movement. Item Specifications: Largest Cog, 34, Color, Carbon, Rear Der/Shifter Compatibility, Campy 12-Speed Chorus/Record/Super Record 2019+, Rear Derailleur Mount Type, 10×1 Standard, Drivetrain Speeds, 12, Chain Wrap Capacity (teeth), 37, Cage Length, Medium. Expert customer service by bike experts! A Real Brick And Mortar Retail Bicycle Shop with people you can talk to! (9-5 Mon-Fri, 12-4 Sat & Sun EST). Video will open in a new window. Campagnolo Record Rear Derailleur – 12 Speed, Medium Cage, Carbon. Professional Customer Service- available 7 days a week Check out our 200,000+ amazing reviews! 365 Cycles delivers all your cycling needs fast! We don’t waste time preparing your order. Our priority is to serve our customers first and foremost. If you need help picking the right product, have questions about bike component compatibility, or just want to geek out about bikes we are here 7 days a week! Simply put, we are bike experts from dirt to tarmac and want to make sure you get the full 365 Cycles experience when you shop with us. At 365 Cycles our mission is to simplify the shopping experience. We’re dedicated to building lasting relationships with our customers, communities, and team members. We combine the knowledge and service of a traditional bicycle shop with the convenience of shopping in your own home. Compare First Class vs Priority as sometimes Priority can be cheaper and it gets to you faster! 365 Cycles 1180 Enterprise Rd East Petersburg, PA 17520 United States. Sign up for news, special offers & other good stuff!