On a bike there's one(or more) front sprocket(s) by the pedals connected by a chain to one(or more) rear sprocket(s) by the rear wheel. As the wheel isn't driven directly by the pedals, and there's usually a difference in size between the front & rear sprocket this constitutes a gear.
A bicycle is both.
The bicycle gear ratio is important because it determines how easily you can pedal and how fast you can go. A higher gear ratio means you can go faster but it's harder to pedal, while a lower gear ratio makes it easier to pedal but you go slower. Finding the right gear ratio can improve your efficiency and performance when riding a bicycle.
The function of a cassette gear in a bicycle's drivetrain system is to provide different gear ratios, allowing the rider to adjust the resistance and speed when pedaling.
The function of a cassette sprocket in a bicycle's gear system is to provide different gear ratios, allowing the rider to adjust the resistance and speed when pedaling.
The gear ratio in a fixed gear bicycle determines how easily the pedals turn in relation to the wheel's rotation. A higher gear ratio means more effort is needed to pedal, but it can lead to faster speeds. Conversely, a lower gear ratio requires less effort but may limit top speed. The gear ratio is important for controlling speed, acceleration, and overall efficiency while riding a fixed gear bicycle.
Neither I or Google knows what a "hake bicycle" is.... come back with a description.
An auto gear shifting bicycle offers the benefit of automatically adjusting gears based on speed and terrain, making it easier for riders to maintain an optimal pedaling cadence. This can result in a smoother and more efficient riding experience compared to a manual gear shifting bicycle, where the rider must manually adjust gears.
An automatic gear shifting bicycle offers the benefits of convenience and ease of use compared to a manual gear shifting bicycle. With automatic shifting, the bike adjusts gears automatically based on speed and terrain, allowing for a smoother and more efficient ride without the need for manual gear changes. This can result in a more enjoyable cycling experience for riders of all skill levels.
Put simply... it's a circle of links that connects the drive gear (attached to the pedals) to the speed gear(s) - attached to the rear wheel. Rotating the drive gear (using the pedals) transfers the movement to the gear cogs on the rear wheel - which propels the bicycle forwards.
A 1x7 drivetrain on a bicycle simplifies gear shifting and maintenance, reduces weight, and offers a wide range of gear ratios for various terrains.
Using a bicycle internal gear hub offers advantages over traditional external gear systems such as better protection from weather and debris, easier maintenance, and a cleaner appearance.
Fixed gear vertical dropouts in a bicycle offer advantages such as easier wheel alignment, increased strength and stability, and better compatibility with fixed gear or single-speed setups.