Single Wheel http://www.ec21.com/offer_detail/Sell_19.5_SS_wheel

16 Inch Alcoa Dually Wheels - One of the wheels may be a circular ingredient that is supposed to rotate for an axle bearing. The wheel is several components of the wheel and axle which is one of the six simple machines. Wheels, in partnership with axles, allow heavy objects for being moved easily facilitating movement or transportation while supporting a large quanity, or performing labor in machines. Wheels may also be used in other purposes, say for example ship's wheel, wheel, potter's wheel and flywheel.Common examples are merely in transport applications. One of the wheels greatly reduces friction by facilitating motion by rolling together using axles. In order for wheels to rotate, some time must have to apply to the wheel about its axis, either by gravity or by the application of another external force or torque.The English word wheel is from the Old English word hweol, hweogol, from Proto-Germanic *hwehwlan, *hwegwlan, from Proto-Indo-European *kwekwlo-, lengthy version of the generator *kwel- "to revolve, navigate around ".Cognates within Indo-European include Icelandic hjól "wheel, tyre", Greek κύκλος kúklos, and Sanskrit chakra, these both meaning "circle" or "wheel ".Precursors of wheels, known as "tournettes" or "slow wheels", were known with the Middle East by way of the 5th millennium BCE (one of the first examples was discovered at Tepe Pardis, Iran, and dated to 5200–4700 BCE). We were holding made of stone or clay and secured to the ground which includes a peg inside the center, but required effort to turn. True (freely-spinning) potter's wheels were apparently active in Mesopotamia by 3500 BCE and perchance as early as 4000 BCE, plus the oldest surviving example, that has been evident in Ur (modern day Iraq), dates to approximately 3100 BCE.
Single Wheel http://www.ec21.com/offer_detail/Sell_19.5_SS_wheel

The very first evidence of wheeled vehicles appears inside lover of the 4th millennium BCE, near-simultaneously in Mesopotamia (Sumerian civilization), the Northern Caucasus (Maykop culture) and Central Europe (Cucuteni-Trypillian culture), so the question which culture originally invented the wheeled vehicle continues unsolved.The first well-dated depiction of any wheeled vehicle (here a wagon — four wheels, two axles) is around the Bronocice pot, a c. 3500 – 3350 BCE clay pot excavated in the Funnelbeaker culture settlement in southern Poland.The oldest securely dated real wheel-axle combination, that from Stare Gmajne near Ljubljana in Slovenia (Ljubljana Marshes Wooden Wheel) is actually dated in 2σ-limits to 3340–3030 BCE, the axle to 3360–3045 BCE.2 types of early Neolithic European wheel and axle are known; a circumalpine sort of wagon construction (the wheel and axle rotate together, that is to say Ljubljana Marshes Wheel), and that also of one's Baden culture in Hungary (axle will not rotate). They are dated to c. 3200–3000 BCE.In China, the wheel was certainly present in the adoption of one's chariot in c. 1200 BCE,although Barbieri-Low[9] argues for earlier Chinese wheeled vehicles, c. 2000 BC.

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TITLE:	Single Wheel http://www.ec21.com/offer_detail/Sell_19.5_SS_wheel
IMAGE URL:	http://image.ec21.com/image/robertzhao690912/OF0008669518_1/Sell_19.5_SS_wheel_simulator.jpg
THUMBNAIL:	https://tse2.mm.bing.net/th?id=OIP.QRlYufxUPwbK9ggkTdX1-QEsEq&pid=Api&w=180&h=181
IMAGE SIZE:	39248 B Bs
IMAGE WIDTH:	560
IMAGE HEIGHT:	557
DOCUMENT ID:	OIP.QRlYufxUPwbK9ggkTdX1-QEsEq
MEDIA ID:	E5FD33793906683414CDEC601F76774CF1C40521
SOURCE DOMAIN:	images.frompo.com
SOURCE URL:	http://images.frompo.com/bad0c6bad80077b82a34a6e16ee3b0d4
THUMBNAIL WIDTH:	180
THUMBNAIL HEIGHT:	181

16 Inch Alcoa Dually Wheels

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