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This is a typical 18 wheeler. It is what you see most often on US highways and is used for interstate transport:

A wheel is usually a reference to a rim and tire combination.Fiber Optic LC/APC Connector/Optical Fiber Connector Single Mode- 18 rim/tire combinations.

It has one wheel and tire on each front position. Each of the other positions typically have two rims and tires for a total of 8 on the rear of the tractor and 8 more on the rear of the trailer.Bread Spiral Conveyor Cooling Tower Machine for Bread Production. These are two separate rims and tires for each position.Latest Stainless Steel Band Wrist Phone Men Women Smart Watch Z60(four tire/rim combinations) visible in this picture:

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A truck with double trailers has lots of rims/tires, but might still be referred to as an 18 wheeler by the public:

Same with triples:

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This is the wheel arrangement on an 18 wheeler:

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If the tractor and trailer were equipped with SS’s, it would be a ten wheeler,Water Resistant Sports Gym Travel Weekender Duffel Bag with Shoe Compartment.

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So,Bread Box Bamboo Large Capacity Roll Top Bread Holder Cupcake Storage Food Bin for Loaf Pastry Snacks? Because it has become a generic term, everyone understands what it means,Plastic Recycling Centrifugal Dewatering Machine. It’s much like steamrollers.They haven’t been driven by steam for almost a century,Cabinet Lock Locker Lock Gym Box Lock Sauna Lock for RFID Locking System.

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The trailers then typically have 2 axles with 2 tyres each per side.Cjx9 Seires Air Condition Definite Purpose AC Magnetic Contactor. Giving 8 tyres/European 450ml Earth Shape Diamond Transparent Clear Glass Wine Bottles.

OEM Membrane Keyboard with Aluminum Backer. There may only be 5 axles sets, with a profile of 5 tyres per side. 4 of those axles hide a second wheel each side.

To save drag and fuel when empty one of each dual axle on the tractor and trailer can be lifted up. In this case, you’d end up with a 10 wheeler on the ground.

Let me straighten this out.

There has been constant, long-standing confusion between the distinct meanings of “wheel”.

Wheel can refer to “wheel rim”. It is the cylindrical structure to which a pneumatic tire is attached. There must be one tire on each wheel rim and I am not aware of any exception.

Wheel can also refer to “wheel hub”. It is the structure to which wheel rim or wheel rims are attached with studs.Medical Smart Digital Baby Thermometer Is Easy to Operate. If the hub is on a driving axle,Inflatable Decorations Advertising Inflatable Snow Globe with Bouncy Air Mattress. On a steering axle, it is the hub that steers which in turn steers the wheel rim. There must be a pair of wheel hubs on one axle, but there can be one or two wheel rims on a wheel hub. Some agricultural tractors even have more than two wheel rims on one hub.

The word “wheel” sometimes refers to wheel rims, as in “18-wheeler”.

A tractor semi-trailer combination is a ubiquitous type of highway freight transportation vehicle all over the world. A tractor which has a “fifth wheel” pulls a semi-trailer,Handmade Lawn Sport Wooden Kubb Set with Customize W01d010“fifth wheel” on the tractor is regarded as an articulation joint.

A typical North American combination consists of a tractor with three axles (one front axle and a set of driving tandem axle), and a semi-trailer with two axles. Before super-Excavator Spare Part Sany Door Lock Assy for 215-8, all axles, except the front steering axle, are fitted with dual-tireson each side. That means two wheel rims, and hence two tires, on each wheel hub. Since one axle has two hubs, an axle with dual-tires counts a total of four tires.

So in the colloquial term “18-wheeler”, the word “wheel” here means “wheel rim”. An 18-wheeler has a total of (2+4+4)+(4+4)=18 wheel rims, and hence 18 tires.

However, an 18-wheeler has only 10 wheel hubs.

When does “wheel” refer to “wheel hub”?

When we refer to driving configurations, as in RWD, FWD, 4x4, etc.

If you ask any truck driver what his/her truck’s driving configuration is, he/12m Portable Hydraulic Mobile Scissor Lift for Repair Road Light

“It’s a 6x4” or “4x2” or “8x6”, etc.

A 6x4 means the truck has three axles, and two of them drive. Because, again, there are two wheel hubs on each axle, you times the axle number by 2 to get the wheel hub number.

But from 6x4, you will not know exactly how many wheel rims or tires the truck has. Most possibly, it has (2+4+4=) 10, but it could also be six (China Prefab Low Cost Industrial Steel Structure Metal Storage Shed for Sale), or other much less possible layout.

So back to your question. Your statement is not wrong. It depends on how you interpret the word “wheel”.

North American 18-Agricultural Irrigation System Plastic Impact Sprinkler:

• Here, “wheel” means “wheel rims” and therefore “tires”, and
• Typically they have 18 wheel rims and therefore 18 tires.

Hope this clarifies things a little bit.