A bicycle is an important tool for both for sustainability and exercise.  If you are planning to buy a bike, choosing the right one for your purposes is essential.  Bikes have different frames, tires, handlebars, seats and suspension based upon their primary use.  The following list should help you choose the right bike for you.

Road bikes: These are best for pavement, and can be used for fitness training, long commutes, racing and long-distance riding.  These can be slightly more expensive than other bikes, so look for a good quality used bike.

Mountain bikes: These sturdy bikes are made to ride on dirt, rocky trails, and gravel roads.  Their shock absorbers make them good for off-road riding.  These bikes can also be expensive, so look for a quality used model.

Recreational bikes:  These bikes are made for pavement or dirt roads, and are designed to be comfortable and easy to handle.  Recreational bikes are best for parks, neighborhoods and flat paths, but not for long distances.  These bikes tend to be less expensive.

Urban and Commuting Bikes: These models are made for riding on pavement, namely city streets (as their name implies).  They are also designed with a sturdy frame and strong wheels to handle city obstacles.  These bikes also tend to be less expensive.

Folding bikes: These bikes are specially designed to fold up and fit into a carrying bag.  They are also lightweight for easy carrying, but strong.  This type of bike is best for combined travel (biking and walking or bussing).

Fixed speed: These bikes have only one speed, and are popular for urban riding.  They require little maintenance and are very light and inexpensive.  However, the lack of gears makes it difficult to ride up even small hills.