volt e byk Alloy Cycle Gear Derailleur Tourney Direct Frame Mount with Bicycle Gear Machine Full Length Rear Fender  (Black)

Bicycle Gear Derailleur with Alloy construction leads to lower weight without compromising strength and durability.6-Speed,7-speed, and 8-speed compatible alloy construction. Durable light action shifting performance for stress-free riding. In road racing the swiftest gear changes are required on the sprints to the finish line, hence high-normal types, which allow a quick change to a higher gear, remain the preference. Low normal or rapid rise rear derailleurs return the chain to the largest sprocket on the cassette when no cable tension is applied. While this was once a common design for rear derailleurs, it is relatively uncommon today. In mountain biking and off-road cycling, the most critical gear changes occur on uphill sections, where riders must cope with obstacles and difficult turns while pedalling under heavy load. This derailleur type provides an advantage over high normal derailleurs because gear changes to lower gears occur in the direction of the loaded spring, making these shifts easier during high load pedalling.