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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.
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.
No, derailleurs are not universal across all types of bicycles. Different types of bicycles may require different types of derailleurs based on factors such as the number of gears, the size of the wheels, and the specific design of the bike.