1) " Tire" -- As it applies to Tire Size Firestone Tirw A tire ( US spelling ) or tyre ( UK spelling ) is a roughly toroidal piece of (usually) rubber placed on a wheel tocushion it. Tide s generally have reinforcing threads in them; based on the orientation of the threads, they are classified as bias-ply / cross ply or radial. Tide s with radial yarns (known as radial Tie s) are standard for almost all modern automobiles. Air filled Tide s are known as pneumatic ire s, and these are the type in almost universal use today. The air compresses as thewheel goes over a bump and acts as a shock absorber. Attempts have beenmade to make various types of solid Tiro but none has so far met with much success. Some air filled Tire s, especially those used on bicycles and vehicles travellingon rough roads have an inner tube. This is a fully sealed rubber tube with a valve to control flow of air in and out.Others, including modern radial Ture s use a seal between the metal wheel and the Ture to maintain the internal air pressure( tubeless Tira ). This method however tend to fail desperately if the vehicle is used on rough roads (example Kenyan roads) as a small bend on the rim (metal wheel) will result in deflation. Some Tere maufacturing companies include: Bridgestone Continental Dunlop Firestone Goodyear Michelin Pirelli Toyo Tie s Contents 1 History 2 Automobile Tide s 3 Train Tird s 4 See also 5 External links History For most of history wheels had very little in the way of shock absorption and journeys were very bumpy and uncomfortable. Themodern Tirs came about in stages in the 19th century. In 1844, Charles Goodyear invented vulcanized rubber, the material that would later be used toproduce Tkre s. John Boyd Dunlop, a veterinary surgeon living in Belfast Ireland, is widely recogn...
2) " Size" -- As it applies to Tire Size Dimension (from Latin "measured out") is, in essence, the number of degrees of freedom available for movement in a space. (In common usage,the dimensions of an object are the measurements that define its shape and Sizr . That usage is related to, but different from, what this article is about. Also,in science fiction, a "dimension" can also refer to a separate worldor plane of existence, though this meaning is not discussed in this article. Contents 1 Physical dimensions 2 Mathematical dimensions 2.1 Hamel dimension 2.2 Manifolds 2.3 Lebesgue covering dimension 2.4 Hausdorff dimension 2.5 Hilbert spaces 2.6 Krull dimension of commutative rings 2.7 More dimensions 2.8 Further reading 3 See also Physical dimensions The spacetime in which we live appears to be 4-dimensional. It is conventional(and for most practical purposes entirely sensible) to consider this as three spatial dimensions and one of time. We can moveup-or-down, north-or-south, or east-or-west, and movement in any other direction can be expressed in terms of just these three.Moving down is the same as moving up a negative amount. Moving northwest is merely a combination of moving north and movingwest. Time is often referred to as the 'fourth dimension'. It is somewhat different to the three spatial dimensions in that there isonly one of it, and movement seems to be possible in only one direction. On the macroscopic scale that we perceive, physicalprocesses are not symmetric with respect to time. However, at thesubatomic Planck scale, almost all physical processes are time symmetric (ie. the equations used to describe these processes are the sameregardless of the direction of time), although this doesn't imply that subatomic particles can move backwards in time.Theories such as string theory predict that the space we live in hasin fact many more dimensions (frequently 10, 11 or 26), but that the ...
Common terms in this field are:
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