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Actually they don't. Today you can get belt driven bikes, or shaft driven bikes. And back in the days there used to be direct-drive bikes with the pedals solidly bolted to the wheel axle. There's also been a treadle-driven bicycle.
But direct-drive makes it awkward to find a comfortable riding position, and to get any speed you end up with really big drive wheels. Treadle-drive needs more moving parts interacting. Transmission shaft bikes tend to experience"wind-up" when being pedalled hard, and quite a bit of power is lost in the type of gearing that is needed in the power transfer train. Belt drive can be quite good, but as the belts can't be opened or cut to size, these bikes usually need special frame designs.
A chain is easier to work with than a belt, has simpler mechanics than a treadle, less mechanical losses than a shaft, and better speed/fit options than a direct drive, so it became the most common design.
What else can I help you with?
What maintenance should you do on a bicycle?
Answer: LUbricate the Chain (Not using WD40) Keep Tyres Inflated Keep All Bearings adjusted and greased.
What happens when you dont keep the chain or gears on your bike greased and why does that happen?
if you don't keep your chain and gears on your bike greased it will rust and come off.
How many bicycle chain links are typically found in a standard bicycle chain?
A standard bicycle chain typically has around 116 links.
How can I determine the condition of my bicycle chain using a bicycle chain checker?
To determine the condition of your bicycle chain using a bicycle chain checker, simply place the tool on the chain and follow the instructions provided. The tool will measure the wear of the chain, indicating whether it needs to be replaced.
What is the standard chain width for a 9-speed bicycle chain?
The standard chain width for a 9-speed bicycle chain is 6.6mm.
What is the standard chain width for an 8-speed bicycle chain?
The standard chain width for an 8-speed bicycle chain is 7.1 mm.
What is the purpose of a bicycle chain splitter and how is it used to maintain and repair a bicycle chain?
A bicycle chain splitter is a tool used to remove and replace links in a bicycle chain. It is used to maintain and repair a bicycle chain by allowing the user to adjust the length of the chain or replace damaged links. The tool works by pushing out the pin that holds the chain links together, making it easier to separate or connect the chain as needed.
What type of lubricant should I use for my bicycle chain to ensure smooth and efficient performance?
For your bicycle chain, use a bicycle-specific chain lubricant to ensure smooth and efficient performance.
What are the best practices for maintaining a bicycle chain with the use of bicycle chain oil?
To maintain a bicycle chain, apply bicycle chain oil regularly to lubricate and protect it from wear. Wipe off excess oil and dirt before applying new oil. Clean the chain periodically with a chain cleaner tool. Check the chain for wear and replace it if necessary.
What is the best method for removing a bicycle chain using a bicycle chain removal tool?
To remove a bicycle chain using a bicycle chain removal tool, first, position the tool over one of the chain links. Then, turn the handle of the tool to push the pin out of the link. Repeat this process on another link to completely remove the chain.
What is the purpose of a bicycle chain wrench and how does it differ from a regular wrench?
A bicycle chain wrench is a specialized tool used to remove or install the chain on a bicycle. It differs from a regular wrench in that it is designed specifically for working with bicycle chains, with a shape and size that allows for easier manipulation of the chain.
What is the standard measurement for the distance between two consecutive rivets on a bicycle chain, known as the bicycle chain pitch?
The standard measurement for the distance between two consecutive rivets on a bicycle chain, known as the bicycle chain pitch, is 1/2 inch or 12.7 millimeters.
