Swatch

Normally a watch would be worn on the left wrist; the main reason for this was because a watch needed to be wound up every day in order to keep running. After placing it on the wheel, the tire is cooled, and it shrink fits onto the wheel. In December 2005, Swatch has launched a new marketing stunt in Switzerland (to be launched in other countries) which is all about wearing the Swatch on the right wrist. As the tire heats, it expands, making it big enough to fit around the wheel. They have now become fashionable objects, generating specialised models (the "Flik-Flak" for children, semi-automatic movements, and even diamond-decorated swatches). Railroad workshops generally have special equipment to do so. Swatch itself has also diversified its offerings considerably, and the company now sells more than a dozen different types of watches, including metal-bodied watches (the Irony series), diving watches (the Scuba series), thin and flat bodied watches (the Skin family) and even an Internet-connected watch that can download stock quotes, news headlines, weather reports, and other data (the Papparazzi series). To fit a tire, it is heated up until it is glowing hot.

These brands include: Breguet, Blancpain, Jaquet Droz, Glashütte-Original, Léon Hatot, Omega, Rado, Longines, Tissot, Calvin Klein, Certina, Mido, Pierre Bal-main, Hamilton, Flik Flak and Endura. As with wagon wheels, the tire is held by an interference fit - it is made slightly smaller than the wheel on which it is supposed to fit. Although sales of Swatch watches are now considerably lower than in previous years, the Swatch Group remains the world's largest watch company, and the Group has accelerated its acquisition of Swiss luxury brands in recent years. No obvious form of fastening is generally used to attach it. Artist watches gave a new cachet to what had previously been a trendy youth article. The tire is a hoop of steel that is fitted around the steel or iron wheel. During this same time, Swatch introduced the idea of partnering with noted artists, including Keith Haring, Andy Warhol, and others. Replacing a whole wheel because of a worn contact surface proves expensive, so the concept of fitting steel tires to train wheels came about.

Swatches enjoyed their peak popularity in the United States during the mid-1980s, when a series of "Swatch Stores" were founded for the express purpose of selling Swatches. The friction so caused can heat the wheel (and rail) enough to cause permanent heat damage. Compared to conventional watches, a Swatch was 80% cheaper to produce by fully automating assembly and reducing the number of parts from the usual 91 or more to only 51 components. Another, different form of damage to a train's wheels takes place if violent wheelslip occurs. With an aggressive marketing campaign and a very resonable price for a Swiss-made watch, it gained instant popularity in its home market. Wear can also take place unevenly if wheels lock up under heavy braking, causing flat spots. Sales targets were set to 1 million timepieces for 1983 and 2.5 million the year after. The shape of a train wheel is designed and specified precisely for the best possible riding and cornering characteristics, and too much wear can alter that.

Initially the price ranged from CHF 39.90 to CHF 49.90 but was standardized to CHF 50.00 in autumn of the same year. As well as the simple wearing away of the wheel surface, a wheel that wears begins to deviate from the correct profile. The first collection of 12 Swatch models was introduced on March 1, 1983 in Zürich, Switzerland. Efficient though the rolling of steel wheel on steel rail is, wear still takes place - on acceleration, on braking, and on cornering. Hayek, the Chairman of the Swatch Group, affirms that the original contraction was "Second Watch" -- the new watch was introduced with a new concept of watches as casual, fun, and relatively disposable accessories. (Some trains, mostly certain types of metros and people movers, have rubber tires, including some lines of the Paris Métro, the Mexico City Metro, the Caracas Metro and the Montreal Metro). The name "Swatch" is often misconstrued as a contraction of the words "Swiss Watch", but Nicholas G. The steel wheels of trains are fitted with tires which are themselves usually made of steel.

During this time, Swiss manufacturers lost most of their market share to Japanese companies like Seiko. See: Tire manufacturing. Swatch was originally intended to re-capture entry level market share lost by Swiss manufacturers during the aggressive growth of Japanese companies in the 1960s and 1970s. Because of slow leaks or changes in weather or other conditions, tire pressure may occasionally have to be adjusted, usually by refilling through the valve stem with some pressurized air which is often available at service stations. Swatch is a brand of stylish quartz watches (some available in Automatic) produced by The Swatch Group Ltd. There are simple hand-held tire-pressure gauges which can be temporarily attached to the valve stem to check a tire's interior air pressure. Routine maintenance including tire rotation, exchanging the front and rear tires with each other, is often done periodically to even out tire wear.

Front tires, especially on front wheel drive vehicles, have a tendency to wear out more quickly than rear tires. Alternatively, many modern cars and trucks are equipped with run flat tires that may be driven with a puncture - or perhaps are even self-repairing for moderate sized holes. Cans of pressurized "gas" can sometimes be bought separately for convenient emergency refill of a tire. Not included, but sometimes available separately, are hand or foot pumps for filling a tire with air by the vehicle owner.

Jacks and tire irons for emergency replacement of a flat tire with a spare tire are included when buying a new car. A few modern vehicle models may use conventional spare tires also. Years ago, full-size or conventional spare tires were used. These days, most spare tires for cars are smaller than normal tires (to save on trunk space, gas mileage, and cost) and should not be driven very far before replacement with a full-size tire.

Vehicles typically carry a spare tire, already mounted on a rim, to be used in case a flat tire or blowout occurs. Occasionally, other types of damage require replacement of a tire. This replacement means the tire will have to be taken off the rim and remounted after the valve replacement. A leaking valve stem may occasionally be the cause of a leak, necessitating valve stem replacement.

The damaged tire typically must be replaced after that. Sometimes a more serious rupture of the tire material occurs resulting in a blowout. Tire repair with such patches requires the tire to be taken off the rim and then remounted after the patch is applied. Patches covering a hole have been glued or rubber-cemented to the interior surface of a tire also, particularly if a hole is too elongated for a simple plug.

The rubber covering the plug solidifies rather quickly, after which the protruding ends of the plug can be cut off, the tire can be refilled with air to the appropriate pressure, and the repaired wheel replaced on the vehicle. Then a plug coated with a semi-liquid form of rubber can be inserted into the hole with a special tool. A puncturing object, such as a nail or a screw, can be pulled out using pliers. If submerging a tire underwater is not possible, the leak can be searched for by covering the pressurized tire surface with a soapy solution to see where leaking air forms soap bubbles.

A leak in a tire can often be found by submerging the tire, pressurized with air, under water to see where air bubbles come out. If the hole is small and not elongated, the tire can often be repaired by using plugs from a tire repair kit. Many leaks in flat tires, though, are caused by nails, screws, caltrops, broken glass or other sharp objects puncturing the rubber tire wall. A leak may be slow in a few cases, such as is sometimes observed when the seal between the rim and tire edge is not perfect.

Sometimes a pneumatic tire gets a hole or a leak through which the air inside leaks out resulting in a flat tire, a condition which must be fixed before the car can be driven further safely. Because this bonding may occasionally come loose on the tire, new tires are superior to recapped tires. a new layer of rubber with grooves is bonded onto the outer perimeter of a worn tire. e.

Sometimes tires with worn tread are recapped, i. A bald tire should be replaced as soon as possible. When the tread is worn away completely and especially when the wear on the outer rubber exposes the reinforcing threads inside them, the tire is said to be bald. More wear on a tire facing the outside or the inside of a car is often a sign of bad wheel alignment.

Uneven or accelerated tire wear can be caused by bad wheel alignment. The same tire rims can usually be used throughout the lifetime of the car. When the tire tread becomes too shallow, the tire is worn out and should be replaced. Friction from moving contact with the road causes the tread on the outer perimeter of the tire to eventually wear away.

This is likely to increase the tire life, but may turn out to be a bad idea if the worn out part of nanocarbon deposited on the roads is washed off and ends up in the food chain. There is currently an attempt to reinforce the tire with nanomaterial. Essentially, part of the tire tread is shallower than the rest and will show when the tire is worn down to that level. Wearbars may be designed into the tire tread to indicate when it is time to replace the tire.

Local legislation may specify minimum tread depths, typically between 1/8" (3.2 mm) and 1/32" (0.8 mm). Tire tread gauges are small rulers designed to be inserted into tire treads to measure the remaining tread depth. Tire rotation moves tires between the different wheels of the vehicle as front and back axles carry different loads and thus the tires wear differently. It is important not to put a 'clockwise' tire on the left hand side of the car or a 'counter-clockwise' tire on the right side.

Some tread designs are unidirectional and the tire has a rotation direction indicated by an arrow showing which way the tire should rotate when the vehicle is moving forwards. New automotive tires now also have ratings for traction, treadwear, and temperature resistance (collectively known as UTQG ratings); as well as speed and load ratings. See tire code. Automobile tires have numerous rating systems.

This is known in general throughout the industry as Tyre Uniformity. Tires outside the specified limits for RFV and LFV are rejected. These variations are measured as Radial Force Variation and Lateral Force Variation, which are measured on a Force Variation Machine at the end of the manufaturing process. This was because the structure and manufacture of a radial tire lends itself to the problems of variation in stiffnes around the tyre.

With the introduction of radial tires, however, it was found that some vibrations could not be cured by adding balance weights. Such tire balancing with these kind of weights avoids vibration when the vehicle is driven at higher speeds. Because tires are often not made with perfectly even mass all around the tire, a special tire-balancing apparatus at a repair shop spins the wheel with the tire to determine where small weights should be attached to the outer edge of the rim to balance out the wheel. The rim with the tire mounted onto it comprises the removable wheel, which is then attached to the vehicle through a number of holes in the rim using lug nuts.

After mounting, the tire is inflated (pressurized) with air through the valve stem to manufacturer's specified pressure, which is more than atmospheric pressure. The common motor vehicle tire is mounted around a steel rim at service stations or repair shops for vehicles using a special tire mounting apparatus while the wheel is off the vehicle. The "steering feel" of such tires is also different from that of pneumatic tires, as their solidity does not allow the amount of torsion that exists in the carcass of a pneumatic tire under steering forces, and the resultant sensory feedback through the steering apparatus. The result is a tire which is less forgiving, particularly with regards to sharp transient bumps and provides poor ride and handling characteristics.

As a result compression is localised within the tire and the effective spring rate rises sharply as the tire compresses. "Airless" tires usually employ a type of foam or sponge like construction which consists of a large number of small air filled cells. The air in conventional pneumatic tires acts as a near constant rate spring because the decrease in the tire's volume as the tire compresses over a bump is minimal. Attempts have been made to make various types of solid tire but none has so far met with much success.

Tires are inflated through a Schrader valve. The air compresses as the wheel goes over a bump and acts as a shock absorber. Pneumatic tires are made of a flexible elastomer material such as rubber with reinforcing threads/wires inside the elastomer material. Air-filled tires are known as pneumatic tires, and these are the type in almost universal use today.

This work was done by a wheelwright, a craftsman who specialized in making wagon wheels. The tire was heated in a forge, placed on the wheel and quenched, causing the metal to shrink, which drew the rim against the spokes and provided stiffness to the wheel. The earliest tires were hoops of metal placed around wagon wheels. Tires with radial yarns (known as radial tires) are standard for almost all modern automobiles.

Pneumatic tires generally have reinforcing threads in them; based on the orientation of the threads, they are classified as bias-ply/cross ply or radial. The inner tubes are usually made of halobutyl rubber, because of its suitable mechanical properties and excellent impermeability for air. This method, however, tends to fail desperately if the vehicle is used on rough roads (for example Kenyan roads) as a small bend on the rim (metal wheel) will result in deflation. Others, including modern radial tires, use a seal between the metal wheel and the tire to maintain the internal air pressure (tubeless tire).

This is a fully sealed rubber tube with a valve to control flow of air in and out. Some air-filled tires, especially those used with spoked wheels such as on bicycles, or on vehicles travelling on rough roads, have an inner tube; this was also formerly the case of automobile tires. To avoid tearing at these inner edges, particularly when the tire is being mounted, there are a number of concentric steel wires buried inside the rubber at both inner edges of the tire. The sidewalls are the sections of the tire which are between the crown and the inner circular edges of the tire contacting the rim.

When the tread on the outer perimeter of the tire inevitably wears away from use, reducing the tread depth, the tire should be replaced. The depth of these grooves essentially constitutes the tread depth at any time during the lifetime of the car. Traction is especially important for good braking. Without such grooves, a layer or film of water would form between the wet roads and the tire surface, which would cause hydroplaning, substantially reducing traction.

The water from the rain would be compressed into the grooves by the vehicle's weight, providing better traction in the tire to road contact. These grooves are especially useful during weather with rain (or snow). The outer perimeter of the tire, often called the crown, has various designs of jagged shaped grooves in it. Fowler also notes that the altered spelling tyre originally met with resistance from conservative British institutions such as The Times newspaper.

According to the Oxford English Dictionary, quoted in Fowler's Modern English Usage, the word is a shortening of attire, and the British spelling tyre is a recent divergence from historical tradition. External link: Robert William Thomson. In 2005, Michelin was reported to be attempting to develop a tire and wheel combination, the Tweel, which does not use air. All modern car tires are now radial.

This type of tire uses parallel carcass plies for the sidewalls and crossed belts for the crown of the tire. The radial tire was invented by Michelin, a French company, in 1946, but did not see wide use in the United States, the largest market at that time, until the 1970s. Dunlop's company has since merged with the Bridgestone company, after a brief partnership with Pirelli. The invention quickly caught on for bicycles and was later adapted for use on cars.

Dunlop partnered with William Harvey du Cros to form a company which later became the Dunlop Rubber Company to produce his invention. By Dunlop's time, the bicycle had been fully developed (see Rover) and it proved a far more suitable application for pneumatic tires. Because neither bicycles nor automobiles had been invented when Thomson produced his tire, that tire was only applied to horse drawn carriages. It wasn't long before rubber inner tubes were invented.

Dunlop's tire had a modified leather hosepipe as an inner tube and rubber treads. John Dunlop re-invented the tire for his ten year old son's tricycle in 1887 and was awarded a patent for his tire in 1888 (rescinded 1890). The tire gave a good ride, but there were so many manufacturing and fitting problems that the idea had to be abandoned. This invention consisted of a canvas inner tube surrounded by a leather outer tire.

In 1845 the first pneumatic (inflatable) tire was patented by fellow Scotsman, the engineer Robert William Thomson as the Aerial Wheel. John Boyd Dunlop, a Scottish veterinary surgeon working in Belfast, Ireland, is widely recognized as the father of the modern tire, although he was not the first to come up with the idea. In 1844, Charles Goodyear invented vulcanization, the process that would later be used to produce cured rubber tires. The modern tire came about in stages in the 19th century.

For most of history wheels had very little in the way of shock absorption and journeys were very bumpy and uncomfortable. .
. spelling) or tyre (UK spelling) is a roughly toroidal piece of material placed on the circumference of a wheel, either for the purpose of cushioning or to protect the wheel from wear and tear.

A tire (U.S. The large lugs on mud tires tend to tear and chip on roads, because they are made from hard rubber compounds that do not bend easily. They can be noisy at highway speeds, and due to the open tread design, they have less of a contact area with the road, limiting traction. Depending on the composition and tread pattern, many mud terrain tires are not well suited to on-road use.

Mud terrain tires also tend to be wider than other tires, to spread the weight of the vehicle over a greater contact patch to prevent the vehicle from sinking too deep into the mud. The large open design also allows mud to clear more quickly from between the lugs. Mud terrain tires are characterized by large, chunky tread patterns designed to bite into muddy surfaces and provide grip. Mud tires