Bicycle wheels come in a wide range of sizes from 12" wheels found on smaller Kids Bikes to larger 29" Mountain Bike and 700c Road Bike wheels. Larger wheels are normally faster and more stable at speed and their larger contact patch improves grip too. Smaller wheels are normally lighter, more maneuverable and have quicker acceleration.
Wheel sizes are defined by the country that first popularized the style of bike that used them - so you'll see some imperial and some metric measurements listed. Wiggle includes the ISO standard in brackets after each for ease of comparison.
BMX (Bicycle Motocross) is a form of cycling on specially designed dirt bikes which usually have 20 inch wheels. BMX or Bicycle Motocross orignated from racing bikes over dirt jumps, this is known as BMX racing. Tricks were also developed using these bikes and this evolved into Freestyle BMX. Freestyle BMX includes five distinct disciplines. These are Street, Park, Vert, Dirt, and Flatland. These usually involve highly technical movements of the bike in different ways over varied terrain. BMX Racing has just become an official Olympic event at the Beijing Olympic games held in 2008. This is a long way from when the sport was started by kids in United States in the early 70's, who imitated their motocross heroes on their road bicycles by riding around the motocross circuit.
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