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Bicycle Gears
Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple gears and thus multiple gear ratios. A shifting mechanism allows selection of the appropriate gear ratio for efficiency or comfort under the prevailing circumstances: for example, it may be comfortable to use a high gear when cycling downhill, a medium gear when cycling on a flat road, and a low gear when cycling uphill. Different gear ratios and gear ranges are appropriate for different people and styles of cycling. A cyclist's legs produce power optimally within a narrow pedalling speed range, or cadence. Gearing can be optimized to use this narrow range as efficiently as possible. As in other types of transmissions, the gear ratio is closely related to the mechanical adva ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hub Gear
A hub gear, internal-gear hub, internally geared hub or just gear hub is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed to the elements. Changing the gear ratio was traditionally accomplished by a shift lever connected to the hub with a Bowden cable, and twist-grip style shifters have become common. Hub gear systems generally have a long and largely maintenance-free life though some are not suitable for high-stress use in competitions or hilly, off-road conditions. Many commuter or urban cycles such as European city bikes are now commonly fitted with 7-speed gear-hubs and 8-speed systems are becoming increasingly available. Older or less costly utility bicycles often use 3-speed gear-hubs, such as in bicycle sharing systems. Many folding bicycles use 3-speed gear-hubs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bicycle Commuting
Bicycle commuting is the use of a bicycle to travel from home to a place of work or study — in contrast to the use of a bicycle for sport, recreation or touring. Commuting especially lends itself to areas with relatively flat terrain and arrangements to keep riders relatively safe from the hazards of accidents with motorized traffic, e.g. separated bicycle lanes and a general acceptance of cyclists as traffic participants. The rise of the electric bicycle which is quickly surpassing the sales of conventional bicycles will effectively increase bicycle commuting in hilly areas and allow for longer journeys. A bike bus is a form of collective bicycle commuting where participants cycle together on a set route following a set timetable. Cyclists may join or leave the bike bus at various points along the route. Bicycles are used for commuting worldwide. In some places, like the Netherlands, cycling to work is very common. Elsewhere, commuting by car or public transport is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cruiser Bicycle
A cruiser bicycle, also known as a beach cruiser or (formerly) motobike, is a bicycle that usually combines balloon tires, an upright seating posture, a single-speed bicycle, single-speed drivetrain, and straightforward bicycle frame#Frame materials, steel construction with expressive styling. Cruisers are popular among casual bicyclists and vacationers because they are very stable and easy to ride, but their heavy weight and balloon tires tend to make them rather slow. Another common feature is their ability to be customized with accessories including fenders, lights and saddle bags. They are designed for use primarily on paved roads, low speeds/distances, and are included in the non-racing/non-touring class and heavyweight or middleweight styles of the road bicycle type. The bikes, noted for their durability and heavy weight, were the most popular bicycle in the United States from the early 1930s through the 1950s, and have enjoyed renewed popularity since the late 1990s. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BMX Bike
A BMX bike is a bicycle used for cycle sport, specifically racing or stunt riding. BMX stands for ''bicycle motocross''. Construction Though originally denoting a bicycle intended for BMX racing, the term "BMX bike" is now used as a generic term to encompass race bikes ('class' and 'cruiser') and those used for freestyle disciplines (street, vert, park, flatland), and dedicated dirt jumper bicycles. Frames are made of various types of steel, aluminum, or carbon fiber. Cheaper, low-end bikes are usually made of steel. Higher range freestyle bikes are mostly chromoly, such as lightweight 4130 chromoly, or generation 3 chromoly. BMX race bikes extensively use aluminum or carbon fiber. BMX bikes are smaller in size as compared to other bikes. These bikes come with thick and fat tires to absorb shocks and for better jumping. Generally, rear brakes are available only in racing BMX. Models BMX bicycles are available in these types: * Dirt – These bikes feature tires with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penny-farthing
The penny-farthing, also known as a high wheel, high wheeler or ordinary, is an early type of bicycle. It was popular in the 1870s and 1880s, with its large front wheel providing high speeds, owing to it travelling a large distance for every rotation of the wheel. These bicycles had solid Natural rubber, rubber tires and as a consequence the only Shock absorber, shock absorption was in the saddle. The penny-farthing became obsolete in the late 1880s with the development of modern bicycles, which provided similar speed, via a chain drive, chain-driven gear train, and comfort, from the use of pneumatic tires. These later bikes were marketed as "safety bicycles" because of the greater ease of mounting and dismounting, the reduced danger of falling, and the reduced height to fall, in comparison to penny-farthings. The name came from the British penny (British pre-decimal coin), penny and farthing (British coin), farthing coins, the penny being much larger than the farthing, so that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drive Wheel
A drive wheel is a wheel of a motor vehicle that transmits force, transforming torque into tractive force from the tires to the road, causing the vehicle to move. The powertrain delivers enough torque to the wheel to overcome stationary forces, resulting in the vehicle moving forwards or backwards. A two-wheel drive vehicle has two driven wheels, typically both at the front or back, while a four-wheel drive has four. A steering wheel is a wheel that turns to change the direction of a vehicle. A trailer wheel is one that is neither a drive wheel, nor a steer wheel. Front-wheel drive vehicles typically have the rear wheels as trailer wheels. Drive wheel configurations Front-wheel drive Front-wheel drive (FWD) vehicles' engines drive the front wheels. Using the front wheels for delivery of power as well as steering allows the driving force to act in the same direction as the wheel is pointing. This layout is commonly used in modern passenger cars. A rare example of front ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chainring
The crankset (in the US) or chainset (in the UK) is the component of a Bicycle drivetrain systems, bicycle drivetrain that converts the reciprocating motion of the rider's human leg, legs into rotational motion used to drive the bicycle chain, chain or belt-driven bicycle, belt, which in turn drives the rear bicycle wheel, wheel. It consists of one or more sprockets, also called ''chainrings'' or ''chainwheels'' attached to the ''Crank (mechanism), cranks'', ''arms'', or ''crankarms'' to which the pedals attach. It is connected to the rider by the bicycle pedal, pedals, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette (bicycle part), cassette or cogset, freewheel via the chain. Parts Cranks The two ''cranks'', one on each side and usually mounted 180° apart, connect the bottom bracket axle to the pedals. Lengths Bicycle cranks can vary in length to accommodate different sized riders and different types of cycling. Crank length is measu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gear Inches
Gear inches is one way of measuring the gear ratio(s) of a bicycle, so that different gears and different bicycles can be compared in a consistent manner. Gear inches is an imperial measure corresponding to the diameter in inches of the drive wheel of a penny-farthing bicycle with equivalent ( direct-drive) gearing. A commonly used metric alternative is known as metres of development or rollout distance, which specifies how many metres a bicycle travels per revolution of the crank. Typical gear ratios on bicycles range from very low or light gearing around 20 gear inches (1.6 metres per revolution), via medium gearing around 70 gear inches (5.6 m), to very high or heavy gearing around 125 gear inches (10 m). As in a car, low gearing is for going up hills and high gearing is for going fast. Origin of the term gear inches When the high wheeler or penny-farthing was the "ordinary" bicycle form, the comparative diameter in inches of the driven wheel was an indication of re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
