Bicycle frames are constructed from materials which place emphasis on being strong, lightweight and stiff to aid power transfer. Aluminum, titanium, steel and carbon are widely used in all levels of frame production.
Major bike manufacturers produce a new range of bikes on an annual basis and this determines the model year of a particular bike. This annual turnover is fueled by advancing technology, industry trends and customer demand for a particular feature or style of bicycle.
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.
Balance Bikes are kids bikes without pedals. They are an ideal way for young children to learn to ride, learing to balance and control the bike before progressing to pedals, without ever needing stabilizers. They are perfect if you have some gentle apartment and downhill stretches to help them enjoy coasting along. Young children often find hand brakes difficult to use, and are better at stopping with their feet, so set the saddle to a comfortable height to allow them to put both feet down. As they are very simple these bikes are supplied in retail boxes, normally with a small amount of self-assembly required.