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.
An inner tube pressurizes the area beneath the bike tire. The edges of the tire wrap over the edges of the rim with the inner tube nestled inside the tire. It is an essential component in making a bicycle wheel function. The inner tube keeps your bike tires hard and helps them roll smoothly.
Inner tubes are good because there are a wide variety of inner tubes available in different sizes, valves and materials for you to choose from. All you have to do is find a tube that is fit for the purpose of your style of riding and budget.
Choose an inner tube that matches your tire size and diameter to ensure the tube fits correctly. Presta or Shrader valves are most common valve types used to inflate the tube. Latex inner tubes offer significant weight savings over butyl rubber inner tubes. The latter also hold air more effectively and are cheaper in price.