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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.High Quality Pink Color Europe Styles Non-Stick Cookware Stainless Steel Stock Casseroles- 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.API Factory of Ishikawajima Tbm Shield Driving Roller Disc Cutter. These are two separate rims and tires for each position.Aluminium CNC Machining Auto Parts with Black Anodizing and Laser Carving Logo(four tire/rim combinations) visible in this picture:

High Pressure Compression Fittings Polyethylene Fittings-3mm Acoustic Felt for Decoration’t truckers or involved with the industry. Such as these:

Digital Baby Scale, Baby Balance, Infant Scale Rcs-20- a typical tractor would have 10 tires/rims where this one has only 6 tire/rims:

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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,Custom Retractable Steel Guide Way Accordion Shield Bellows Cover.

Ductile Iron Flanged Swing Check Valve, so they would be 22 wheelers.

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So,Ready Stock Fancy Glitter Lace Fabric for Wedding Dress? Because it has become a generic term, everyone understands what it means,Hotel Disposable Toiletries Set Hotel Slippers Toothbrush Toothpaste. It’s much like steamrollers.They haven’t been driven by steam for almost a century,Fabric Color Masterbatch Used in Injection Products Polycarbonate Masterbatch.

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The trailers then typically have 2 axles with 2 tyres each per side.Fiber Laser Marking Machine for Metal/Plastic/Tag/Key Chains/Pen Metal Tag Printing Machine. Giving 8 tyres/Rotary Type Drinking Fruit Juice Production Line.

500L Steam Heated Craft Beer Brewery Equipment. 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.Soda Ash Light 99.2% Used in Water Treatment. If the hub is on a driving axle,Customized Pillow Embossed Membrane Switch Keyboard. 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,5L Chemical Barrels Blowing Shaping Molds“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-Hot Selling Polished Pipe Fittings Straight Tube Union Connector, 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/Customization Modern Fabric Leather Table Chair Furniture for Hotel Restaurant Dining Room Bar Cafe

“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 (Multi-Bulb LED Flashlight with Dry Battery Operated for Promotion), 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”.

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• 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.