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The Boeing B-52 Stratofortress is an American long-range, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing , which has continued to provide support and upgrades. It has been operated by the United States Air Force (USAF) since the 1950s, and by NASA for nearly 50 years.
5th gear 1550-2040 g City Shimano Nexus Inter-7: 1995 7 244% 1465-1860 g City Shimano Nexus Inter-5E 2019 5 263% 60 Nm 1st gear 1650 g e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan) 1995 1999 12 339% 3500-4000 g City SRAM i-Motion 9: 2005 2012 9 340% 2000g (w/o brake)-
They can be used individually, as an external derailleur or an internal hub gear, or in combinations such as the SRAM Dual Drive, which uses a standard 8 or 9-speed cassette mounted on a three-speed internally geared hub, offering a similar gear range as a bicycle with a cassette and triple chainrings. Derailleur gears. Cogset; Crankset; Hub gear
Racing bicycles have a relatively narrow gear range and typically vary from medium to very high ratios, distributed across 18, 20, 27, or 30 gears. The more closely spaced gear ratios allow racers to choose a gear that will enable them to ride at their optimum pedaling cadence for maximum efficiency.
A hub gear, [1] internal-gear hub, [2] internally geared hub [3] or just gear hub [4] is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed ...
Usually the second sprocket is larger, which provides the cyclist a lower gear for climbing steep inclines simply by pedaling backwards. While most historical examples of retro-direct bicycles used the reverse gear for climbing, several modern retro-direct riders prefer pedalling forward when standing to accelerate from rest and climb, and ...
The gear range is difference between the highest and lowest gear ratios and may be expressed as a percentage (e.g., 500%) or as a ratio (e.g., 5:1). Heel [ edit ]
Patents for built-in systems to change gear ratios appeared as early as 1890. [8] [9] Adler offered a three-speed gearbox bicycle in the 1930s. [10]Several attempts to develop gearbox bicycles during the 2000s for downhill racing, such as the Honda RN-01 G-cross, incorporated complete derailleur gear drive trains in an enclosure.