Your question doesn't really make sense, as geared bikes also have pedals.
Basically there's a difference between single-speed bikes(like BMXes) and road bikes/MTBs.
On a single-speed bike the rear wheel will turn at the same rate when compared to the pedals all the time.
If you want to ride uphill, you have to push harder, and the faster you go, the faster you have to spin the pedals.
On a geared bike it's possible to change the gear ratiobetween the pedals and the rear wheel. This means that you can trade power for speed , or the other way around.
If going uphill is heavy, you just drop down a gear. It'll lose you some speed, but it'll make you stronger at the same time so that you'll be able to climb the hill.
Fixed gear riding offers a more direct connection between the rider and the bike, providing a unique and engaging riding experience. It can improve pedal efficiency and develop a stronger sense of control and balance. Additionally, fixed gear bikes are typically lighter and require less maintenance compared to bikes with gears and derailleurs.
When riding a bike in low gear, it is easier to pedal but you cover less distance with each pedal stroke. In high gear, it is harder to pedal but you cover more distance with each pedal stroke. Low gear is better for uphill or rough terrain, while high gear is better for flat or downhill surfaces.
A fixed gear bike, also known as a fixie, is a type of bicycle that has a single gear and no freewheel mechanism, meaning the pedals move in sync with the wheel. This makes it necessary to constantly pedal while riding, as the bike does not coast. Fixed gear bikes are simpler in design compared to bikes with multiple gears and are often favored for their minimalistic style and direct connection between the rider and the road.
Bikes with internal gear hubs offer advantages such as low maintenance, protection from weather, and ease of use compared to bikes with external gear systems.
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Fixed gear bikes are not inherently faster than other types of bikes. Speed is influenced by various factors such as rider strength, terrain, and gear ratios.
There are three main types of chainset bikes available in the market: single-speed, geared, and fixed-gear. Single-speed bikes have one gear ratio, geared bikes have multiple gears for different terrains, and fixed-gear bikes have a single gear with no freewheel mechanism.
Not all bikes have "gear". Straddle bikes and direct drive bikes - with cranks directly attached to a wheel axle - don't have gears.
Sparring gear is universal.
The driver gear has the input torque, and the driven gear has the output torque.
Riding a fixed gear bike offers advantages such as simplicity, lighter weight, better control, and a more connected feel with the road. Fixed gear bikes require less maintenance and can improve pedal efficiency.
A fully automatic car doesn't need any action at all to change gear, a semi automatic car can have no clutch pedal, just a gear stick which you pull backwards to gear up or pedals behind the steering wheel.