When a road bike is properly set up and maintained, it should be relatively free of squeaks, creaks and clicking noises. Most bike owners, however, will have to diagnose an unusual noise at some point. Fortunately, a clicking chain doesn't require the assistance of a pro mechanic.

The design concept for the bicycle dates back to the time of DaVinci, however, it was another 150 years before an early version was manufactured. This human-powered vehicle was bulky and more carriage-like than the modern bicycle. In early 1800's Germany, a wooden two-wheeled bicycle appeared.

Bicycles for girls and bicycles for boys are no different in the way they function, but there has long been a difference in their appearance. In a side-by-side comparison, bicycles for girls often have a significantly lower top tube (crossbar) than boy's.

If you have pain in your sit bones after road biking, you most likely used a seat that doesn't fit your rear properly. The road bike seat you use needs to measure just wide enough to support your sit bones. If it doesn't, you'll experience pain following cycling, regardless of how soft or hard the seat feels.

If you are a bicyclist, SAG stands for support and gear. During a race, a SAG vehicle will be a welcome sight as you fatigue or encounter mechanical complications with your bike. If you are not a cyclist, you can support the athletes by volunteering to be a SAG driver.

Across the country, the number of people who use bicycles to commute to work, though still small, has been increasing, reports the League of American Bicyclists. For example, in Portland, Oregon, 6 percent of people commuted to work by bike in 2007.

If you ride your bike for exercise or endurance training, rather than for casual jaunts around your neighborhood, you may have found your legs feeling tired and weak at times. That feeling can be frustrating, especially if you’re anxious to get back your bike or engage in another activity.

The major difference between anaerobic and aerobic conditions is the requirement of oxygen. Anaerobic processes do not require oxygen while aerobic processes do require oxygen. The Krebs cycle, however, is not that simple. It is a part of a complex multi-step process called cellular respiration.

Cyclocross racing was developed to help keep road riders in shape during the off-season. It is an intense event that requires both cross-country and road-riding skills, and helps to hone your riding technique.

Cycling instructor certification allows you to teach indoor cycling courses. In an indoor cycling course, the instructor leads participants in a visual journey, often imitating valleys, hills, straight-aways and finish lines. Indoor cycling is an aerobic-type workout.

People have ridden two-wheeled self-powered vehicles for transport, recreation and sport since the early 17th century. The materials used in bicycle manufacture have changed significantly and modern bicycles are almost unrecognizable from the wood and iron bikes of old.

No matter what kind of bike you ride, you have a choice between platform pedals, toe clips or clipless pedals. Basic platform pedals are wide and flat and can accommodate most shoes. Toe clips are metal or plastic cages that bolt to platform pedals and keep your foot in place with adjustable nylon straps.