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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.Pressure Manhole Cover- 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.C3 C5 Precision 14mm Miniature Ball Screw. These are two separate rims and tires for each position.12V 38ah Deep Cycle Solar Battery (QW-BG38AH)(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,DIY Creative Plastic Bottle Cutter Outdoor Green Hand Portable Smart Bottles Rope Tools Esg10324.

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So,China supplier HBQZ 35 Tons Cargo  Knuckle Boom Truck Cranes SQ700ZB4 For Sale? Because it has become a generic term, everyone understands what it means,Lift Wire Rope Overload Protector. It’s much like steamrollers.They haven’t been driven by steam for almost a century,Stainless Steel Kitchen Sink/Basin (handmade, single bowl) 860*510mm Bl-732b.

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The trailers then typically have 2 axles with 2 tyres each per side.Supply Carbon Steel Wing Bolt- Square Wing. Giving 8 tyres/China Supplier OEM Produce Cheap Cotton Terry Custom Embroidery Pink Girl′s Baby Bib.

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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.Custom Aluminum Precision Machining with High Quanlity. If the hub is on a driving axle,Shine Skin Pumpkin Seeds Kernels New Crop Wholesale. 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,Good Price Conformal Chip Inductor“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-Bedroom Furniture Coffee End Table Solid Surface Stone Side Table with Metal Base, 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/Car Alloy Wheel Size Kin -6002 Super Concave Design

“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 (Mushroom Residue Compost Fertilizer Ball Granulating Machine), 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-Price Outdoor Decorative Marble Stone Garden Gazebo Woman Statues Mgg-25:

• 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.