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What is the Right Size Hybrid Bike for Me

Bike frame sizes are based on the height of the bike, measuring the length of the seat post tube – the part of the bike that the seat post (and saddle) slide into. This measurement is given in metric (cm) for road bikes, and imperial (inches) for mountain bikes.

When considering mountain bike sizes, simply bear in mind that they are usually one or two inches taller. You can use the chart below as a rough estimate for which mountain bike sizes are made for which heights.

Bicycle wheel - Wikipedia, the free encyclopedia

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    Know that you must buy the right frame for your style of riding. The frame is the metal body of the bike, and, unlike the handlebars, saddle, and pedals, it is not adjustable. Thus, buying the proper frame is the most important thing you can do when shopping for a bike. There is a variety of frames available on the market, but the frame shape generally changes based on the type of riding the bike is made for. Know, however, that there are as many different frame configurations as there are bike makers, each with "specialized" functions. However, the general shape of the bike helps determine it's function more often than not:
    • Road bikes are most often used by commuters, fitness, and racing fitness riding. The frames are usually large, isosceles (all sides the same length) triangles with a top bar, or top tube, that is parallel to the ground. Racing bikes usually have smaller frames, while touring or commuter bikes often have larger frames. Road bike frame sizes are measured in centimeters.
    • Mountain bikes have a lower center of gravity to keep you on balance riding over roots, rocks, and mud on the trail. The center triangle is more compact, with the top tube angling down, away from the handlebars. Mountain bike frame sizes are measured in inches.
    • Cruiser bikes have odd, sideways S-shaped or curved frames that allow you to sit nearly upright while riding. The handlebars are high above the seat and the pedals slightly in front of you so that you comfortably cruise around town. Sometimes called "city bikes" or "commuter bikes," these are made for short distances. Fitting these bikes is less about measurements than pure comfort on a test ride.[1]
    • Kids bikes have smaller frames similar to mountain bikes, helping them keep their balance with a lower center of gravity. They are very adjustable to compensate for quickly growing kids. They are usually measured by wheel size.[2]
  • (found on higher end BMX hubs and some mountain bike hubs) ..

    To ease the process of choosing the right size of bike, manufacturers often label bikes with sizes - eg, Small, Medium and Large. These categories help describe which body type the bike will suit best, but only you can be the judge of the fit that's perfect for you. Bear in mind that there is always the option of adjusting the bike, for example at the saddle, until it's just right. The chart below is a general guideline for road bike sizes, based on the rider's height.

    When considering mountain bike sizes, simply bear in mind that they are usually one or two inches taller. You can use the chart below as a rough estimate for which mountain bike sizes are made for which heights.