The most important part of buying a used bike is getting one that fits you. A bike that's uncomfortable will make cycling a chore. Even if it's a little bit uncomfortable, it'll be a LOT uncomfortable after being on it for half an hour. The most important things are to make sure that the handlebars are higher than the seat so you're not hunched over them, and that there's at least at least a couple of inches between the top tube and your crotch when you're standing on the ground, straddling the bike. No matter what your experience as a cyclist choosing the right bicycle is a very important task, which many people find difficult. Bicycles are made with different purposes and with a range of different features, with this in mind the task of buying a new cycle can often be daunting. With a large range of companies out there selling cycles it can be difficult to decide which the best bicycle is for you. However, there are many great value cycles that you can choose from, and the huge selection should make it easier for you to find a bicycle that is just right for you. Bicycle parts are now high technology and using the best possible materials for the job. Lightness and strength are the most important guiding factors for producing the best quality cycle parts. However all bike parts can work smoother with a bit of adjustment. Gears, Chains, Brakes & Wheels Gears, Chain-sets and wheels were originally first made out of heavy steel. Then gradually, the alloys took over and which are strong and durable enough to be used. As the technologies changed and evolved, so did the materials and equipment.