### Instruction: I'm considering buying a bicycle. How do I know which one I should buy?
### Response: It depends on how you want to use the bike and how much budget you have. If you just need one for commute, consider an electric bike if you want to go for a long distance with little effort, or a folding bike if you need to carry it with your car or onto public transportation. Or if you want to buy one for sports, consider a road bike for road cycling, or a mountain bike for tail cycling. A sport bike's price can range from $100s to $1000s. Higher-end bikes usually comes with better material like carbon-fiber or Titanium alloy, which are light-weighted and at the same time sturdy. There are also different types of gear switch and breaks, that can affect the price. Finally, bikes come with different sizes of frame and wheels, you need to find one that fits your body height. Go to a local bike shop and talk to a sales agent to find a bike that best fit your need.