They got really popular in the 80'S with the ten speed. Before that Schwinn had one that was a three speed in the late 60's. You can still find them here and there. I used to buy them and "chop" them. I'd make the front forks 18" longer. Fun.
no
No. Bicycles with external gears have chain-and-sprocket gears. Bicycles with internally geared hubs have both a chain-and-sprocket gear and spur gears (usually in a planetary configuration) inside the rear hub. Then there are the rather rare shaft-drive bicycles, which use bevel gears. And maybe an internally geared hub as well. Then there's the occasional belt drive bike of course. And one or two CVT designs.
Clocks and watches have internal gears. Bicycles and can openers have external gears.
Depends. Bicycles with external gears have chain-and-sprocket gears. Bicycles with internally geared hubs have both a chain-and-sprocket gear and spur gears (usually in a planetary configuration) inside the rear hub. Then there are the rather rare shaft-drive bicycles, which use bevel gears. And maybe an internally geared hub as well. Then there's the occasional belt drive bike of course. And one or two CVT designs.
Two common items that contain gears are watches and bicycles. In watches, gears work together to keep precise time by regulating the movement of the hands. Bicycles utilize gears in their transmission systems to adjust the resistance and speed, allowing for smoother pedaling across different terrains.
Yes. All bikes have at least one gear, some have quite a lot more.
Yes, electric bikes can have gears just like traditional bicycles. Gears help riders adjust the level of resistance and speed while pedaling, making it easier to navigate different terrains.
spur gears are used because there are many things such as bicycles that cant exist without a spur gear' > gearboxes, mechanical watches, cam drives
Automatic shifting bicycles offer the advantage of convenience and ease of use compared to traditional manual shifting bicycles. With automatic shifting, riders do not need to manually adjust gears, making it simpler for beginners or those who prefer a more effortless riding experience. Additionally, automatic shifting can provide smoother transitions between gears, resulting in a more comfortable and efficient ride.
Old timey bicycles, also known as vintage bicycles, typically have a large front wheel and a smaller back wheel, a curved handlebar, and a simple frame design. They often have a single speed and lack gears or brakes. In contrast, modern bicycles have smaller wheels, multiple gears for varying terrain, advanced braking systems, and a more streamlined frame design for efficiency and comfort.
Logos. has written: 'Variable gears' -- subject(s): Bicycles, Gearing, Design and construction
A hub gear system in bicycles offers advantages such as low maintenance, protection from weather elements, and the ability to shift gears while stationary.