Other Bike Parts to Keep in Mind

Earlier in this chapter, we cover important bike parts and how they work together as different systems to support the bike’s proper functioning. Here we want to take a moment to mention some other very critical bike parts or “systems” that are discussed in great detail in other chapters of this book:

✓ Drivetrain: Considered the transmission of a bike, the drivetrain is the system for transferring power from the rider’s legs to the rear wheel. It includes the pedals, cranks, bottom bracket, chain, chainrings, and cogs. (See Chapter 13.)

✓ Steering system: Consisting of the front fork, the handlebars, the stem, and the headset, the steering system enables you to balance and turn a bike. When you turn the handlebars, bearings within the headset allow the system to pivot within the frame’s head tube. (See Chapter 15.)

✓ Suspension: Although a bike will absorb a certain amount of shock as you ride, a bike with a suspension system improves riding comfort and handling in difficult terrains. There are a variety of suspension types including those built into the forks, the stem, the rear part of the frame, and the seat post. (See Chapter 12.)

✓ Brakes: Brakes (see Chapter 8) fall into one of three categories:

• Rim brakes have brake pads that rub against the wheel rim when the brakes levers are squeezed. A cable connects the brake lever to the brakes.

• Disk brakes operate on the hub. Heavier than rim brakes, they offer better performance in wet conditions. Some disk brakes use a hydraulic system, whereas others depend on cables.

• Hub brakes are similar to disk brakes except the brake pads are pushed outward against the inside of a cylindrical drum inside the hub. Included in this family are the good old coaster brakes.

✓ Wheels: Usually consisting of an aluminum or steel rim, connected to a hub by spokes, the wheel is connected to the frame by either a quick — release mechanism or nuts threaded onto the axle. Some modern rims and wheels are made with carbon fiber and other high-tech materials. (See Chapter 7.)

✓ Frame: The frame is what holds everything together. In one way or another, all parts are connected to the frame. A frame consists of a top tube, down tube, seat tube, head tube, seat stays, and chain stays. The geometry of a frame is important, because it greatly impacts the han­dling of a bike. Most issues with frames require professional care; in many cases, buying a new frame is easier than replacing a damaged one. (See Chapter 12.)