The drive train is the part of the bicycle which converts human power into mechanical motion. There are two types of chains - single speed and double-speed. Single Speed Chains are commonly found on bicycles with derailleur gear systems. Double-Speed Chains are typically found on bikes with fixed gear hubs. Both types of chains require lubrication to function properly. Lubricants are applied to the chain using a grease gun or other type of applicator. Once applied, the grease must be allowed to dry before riding. If the chain does not receive enough lubricant during assembly, it could cause excessive friction and lead to premature failure. In addition, improper application of lubricant can result in contamination of the chain links. Chain lube is available in aerosol cans, pump sprays, and squeeze tubes.
There are three main components of the drive train: the crankset, the bottom bracket, and the chain. Each component has its own specific functions. Crank Sets convert human force into rotational movement. Bottom Brackets attach the crank set to the frame. Chains connect the crankset to the bottom bracket. All three components work together to transmit torque from the rider's legs to the wheels.
Single Speed Chains are designed to operate within a certain range of speeds. As the rider increases his/her pedaling rate, the chain moves faster and engages more teeth. At higher rates of pedaling, the chain becomes too tight and binds causing the chain to skip. To avoid skipping, riders reduce their pedaling rate until the chain is moving freely again.
Double-Speed Chains allow the cyclist to pedal at multiple speeds simultaneously. Typically, these chains are equipped with 2x11 gearing. Riders start at a low gear ratio and increase the number of teeth per link as needed. Because there are fewer teeth per link, the chain remains loose throughout the entire range of operation.
All three components of the drive train require periodic maintenance to ensure proper performance. Proper lubrication prevents excessive heat build-up and reduces friction. Heat buildup causes increased wear on bearings and bushings. Friction slows down the rotation of the chain and decreases efficiency.
There are many different types of lubricants available. Some are specifically formulated for each component while others are general purpose products. Aerosols contain liquid lubricants and are easy to apply. Pump sprays dispense solid lubricants that harden upon contact with air. Squeeze tubes are self-contained containers filled with viscous liquids.
Applying lubricant is simple. First, remove excess oil from the hands and face. Next, wipe the inside of the container with a rag or paper towel. Apply the lubricant evenly around the outside of the chain.
Bicycle drivetrains are complex systems with many moving parts. If these parts aren't properly aligned, adjusted, lubricated, and maintained, the whole thing could fail. In addition to being expensive to repair, poorly-maintained bicycles can be dangerous to ride because of poor shifting performance and other problems.
There are several factors to take into consideration when choosing proper bicycle drivetrain components. First, you must decide whether you're going to build your own custom frame or purchase a ready-made bicycle. Second, you must determine which type of drivetrain you'd prefer - singlespeed, fixed gear, geared, or derailleur. Finally, you must select either internally or externally threaded chainrings and sprockets.
Bottom brackets are found inside most frames and hold the crankarms together. Both types fit both single speed and double/triple chainsets.
Chainring selection depends on the gearing ratio desired. Alternatively, if you plan to run a 12-speed cassette, you'll need a 50 tooth front ring and a 52 tooth rear ring.
Sprockets are attached to the outside of the chainwheel and serve as the driving force behind the chain. Sprocket selection depends on the number of gears you wish to shift. For instance, if you plan to run a 7-speed cassette, you'll need a 44T front sprocket and a 46T rear sprocket. Alternatively, if you plan to run a 9-speed cassette, you'll need a 49T front sprocket and a 51T rear sprocket.
Once you've selected the correct size chainring and sprocket combination, you'll need to ensure that the chainline matches the position of the smallest cog. Poor chain alignment causes excessive friction and makes it harder to shift gears. Additionally, improper chain tensioning can cause skipping and jumping during shifts.
To avoid premature failure, bicycle drivetrain components require regular maintenance. Lube is applied to bearings and pivot points using grease or oil. Grease is easier to apply and lasts longer than oil. Oil is recommended for high stress areas such as bearing races where there is little room for movement.
Bicycle drivetrains are complex systems with many moving parts. The more features there are, the harder it is to choose which ones to purchase. There are several different types of drivetrains available today, each designed to perform specific tasks. Some bicycles have derailleur-based drives while others use hub gears. In addition, there are single speed bikes, geared bikes, fixed gear bikes, etc. Each type has its advantages and disadvantages. Here are some features to look for when choosing a drivetrain component.
The most common shifters found on road bikes are cable operated. Cable shifters allow you to shift by pulling on a lever attached to the handlebars. If you prefer a mechanical shifting mechanism, you might be interested in a Shimano shifter. Shifters are typically located near the brake levers so you can quickly change gears while riding. Most modern mountain bikes have electronic shifting mechanisms called "derailleurs". Derailleurs are controlled via cables connected to the rear wheel axle. Many cyclists enjoy the convenience of automatic shifting because it makes cycling easier. However, riders who prefer manual control still appreciate the ability to manually select gears using a traditional shifter.
Low ratio gearing gives you greater top end power, whereas high ratio gears provide smoother pedaling. High ratio gears are generally only useful for racing since they require higher cadence to maintain momentum.
The different types of bicycle drivetrains include chain-driven bicycles, belt driven bicycles, hub gear systems, freewheel systems, and derailleur gears.
In general, there are three main categories of drivetrains: single speed, geared, and fixed gear. Single speed bikes typically have only one cog attached to the crank arm; geared bikes have multiple cogs attached to the crankarm; and fixed gear bikes have no moving parts other than the pedals themselves.
Bicycle chains consist of two parallel rows of teeth with each row containing alternating left and right hand threads. Each tooth has its own thread which engages another thread on the opposite side of the chain. Chains are generally constructed using either round or oval links. Round link chains are more common because they allow for greater flexibility while maintaining strength. Oval link chains provide increased durability by allowing for fewer welded joints. Chain tensioning devices are used to maintain proper chain length during operation.
In a fixed gear system, the rider must pedal continuously to propel the bicycle forward. Fixed gear systems require a special gearing mechanism called a "freewheel" to permit free rotation of the rear wheel. Freewheels are commonly found on mountain bikes where riders prefer to ride downhill rather than uphill. Some cyclists choose to use freewheels on road bikes due to the added comfort afforded by the freewheeling action.
A geared system consists of a front ring and a back ring connected by a series of cogs. Gears are arranged so that the larger diameter rings turn faster than the smaller ones. As the rider pedals, the large rings rotate causing the small rings to spin. Because the ratio between the size of the rings determines the amount of torque applied to the wheels, the gearing can be adjusted to give varying levels of power output.
A hub gear system uses a central axis known as a center pulley to transfer rotational force from the pedals to the rear wheel. Hub gears are most commonly seen on racing bicycles. The center pulleys are mounted directly onto the axle of the rear wheel. There are many variations of hub gears including double and triple crown hubs. Double crown hubs have two sets of spokes radiating outward from the same point. Triple crown hubs have three sets of spokes radiating outward from the same point.
Derailleurs are mechanical devices designed to shift the chain among several sprocket assemblies. Derailleurs are commonly used on multi-speed bicycles. Most derailleurs contain a spring loaded clamp that holds the chain tight against the sprockets. To change gears, the rider moves the shifters to position the desired sprocket assembly into alignment with the chain. Then, the lever releases the chain and the sprocket assembly begins rotating freely.