Airless Tires - The Wheel Reinvented, Road Concerns Deflated?
Non-pneumatic tires (NPTs), simply called airless tires, can be considered a breakthrough. Imagine, a tire that won’t go flat because it’s not supported by air pressure? One company even claimed that these tires will continue rolling even after a blast from a roadside bomb! When will these spectacular airless tires become available for mass production?
Elisa MuellerAug 03, 2023581 Shares82995 Views
Do several 21st-century engineers try to reinvent the wheel by creating airless tires?
The phrases “reinvent the wheel” and “to waste time” often go together when explaining what the former means.
Tire manufacturing companies across the globe appear to be bent on some reinvention of sorts. Are they wasting their time?
A couple of them have long been in the business of tire making for more than a century. Yet, here they are trying to create their own respective versions of the wheel.
The only common denominator in their journey to reinventing the wheel?
They want a tire that won’t go flat.
Will airless tires become as common as sliced bread in the not-so-distant future?
The Future Is a Tesla Fitted With Brand New Airless Tires | Mashable
Defining first another kind of tire- the opposite type and the most common one - will help one understand better what airless tires are.
According to Collins English Dictionary:
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A pneumatic tire is a rubber tire filled with air under pressure and mounted around the wheel of a vehicle.
Pneumatic tires are typically placed on trucks and cars.
In one article published by Toyota Forklifts Blog, Lucas Collom, a former digital projects administrator at Toyota Material Handling (U.S.), identified to types of pneumatic tires:
air pneumatics or air pneumatic tires (“filled with air”)
solid pneumatics or solid pneumatic tires (“made of rubber;” used in heavy equipment vehicles, such as forklifts and tractors)
A man running a yellow ACE road roller in a road construction site
With that said, here’s the author’s take on describing airless tires:
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Airless tires are non-pneumatic tires (NPT). Unlike air pneumatic tires, there’s no air pressure on them.
But like solid pneumatic tires, aka resilient tires (because they are abrasion-resistant, puncture-proof tires), airless tires don’t get flat.
Note, however, that airless tires and run-flat tires are not the same.
A run-flat tire is a kind of a solid pneumatic tire that can still run even after getting punctured. For not being supported by air pressure, an airless tire is also referred to as a flat-free tire.
NPTs are commonly used on the following:
backhoes
farming vehicles
motorized golf carts
ride-on/riding lawn mowers/tractors
wheelbarrows
wheelchairs
The Inquirer reported that when tested, Goodyear’s airless tires can run at a speed of 160 kilometers per hour (about 99.5 miles per hour).
A black-and-white Michelin motorized golf cart with gray seats and airless tires parked on a side road
Aircraft inventor and manufacturer Captain James Vernon Martin (1883/85-1956) from Chicago introduced the airless tires in 1938, according to Outback Travel Australia.
They’re made of “criss-cross spokes of ribbed rubber.”
Side view of James Vernon Martin in dark suit and bowtie examining large black-and-white photos of aircrafts
Per AutoRepair-Review.com, Capt. Martin, also an aviator and Harvard alumnus, called those NPTs in the following order:
Lightweight Resilient Tire
East Biding Tire
Elastic Tire
According to the news site Industry Tap, the University of Wisconsin-Madison developed airless tires for the U.S. military.
If pneumatic tires - or the traditional tires - don’t get punctured, they can last up to approximately 60,000 miles (96,560 km), according to Business Insider.
Tires wear every time they roll because the weight of the vehicle makes them compress and decompress while it’s running.
For example, if a car travels at 70 miles (112 km) per hour, its tires compress and decompress at an estimated 1,000 times per minute.
Per vehicle site Autoily, airless tires can have a lifespan that is three times longer than pneumatic tires.
There are three types of airless tires, by the way, according to Business Day:
Types of Airless Tires
Description
Solid Tires
small chopped up pieces of heavy rubber mixed with asphalt, aka, bitumen
It doesn’t mean anything innovative is already free from probable weaknesses, such as in the case of airless tires.
The Ohio-based SMART Tire Company tweeted just this August that by 2027, the global market value of tires will be worth hundreds of billions of dollars.
The world’s tire market will be worth a staggering $500 billion dollars; the global bicycle market, $150 billion.
Is it high time to seriously consider airless tires? What could be the probable reasons that the public will love - or snub - them?
Airless tires are made of rubber materials and plastic that make them heavy. Moving heavy wheels requires more power, which in return requires more fuel.
So, they are not fuel-efficient.
Here are other the disadvantages of using airless tires:
1. They have lower suspension capabilities; therefore, rides can be rough.
As Lucas Collom stated in Toyota Forklifts Blog, pneumatic tires can “absorb the unevenness of terrain.”
Non-pneumatic tires (NPTs) can’t do that. Rides can therefore be a bit shaky and bumpy.
2. Safety can also be compromised.
Airless tires collect heat as they roll. The heat can build up because it doesn’t get to escape. Overheating can damage the tire and can cause accidents, too.
3. Prices can be expected to be higher than pneumatic tires/conventional tires.
A lot of money is spent on research and development and technology. Those NPTs from Michelin can cost as much as $750 per tire.
4. Airless tires are not ideal in sand and snow as well as in mud.
They could get into the spokes and stay there. The NPTs will lose their balance if such happens.
Business Day reported that based on the findings of the Allied Market Research, the global tire market will experience significant change less than ten years from now.
With a value of $46.1 million in 2020, it will nearly double in 2030, estimated to reach approximately $75 million.
Some of the main players who showed interest over airless tires include the following companies:
Headquartered in Clermont-Ferrand in central France, Michelin (est. 1889) has been pioneering the development of airless tires since the early 2000s.
In 2005, Michelin North America surprised the public with the Tweel (“tire” + “wheel”) designed by Dr. Tim Rhyne and Steve Cron.
The company website describes the Michelin Tweel like this:
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It is comprised of a rigid hub connected to a shear band by means of flexible, deformable polyurethane spokes and a tread band, all functioning as a single unit.
Ahead of its official launch in 2024, the public already heard about Michelin’s latest NPT.
It’s the Uptis (Unique Puncture-proof Tire System) tire, an airless tire made of fiberglass and rubber.
The Uptis is recyclable and fuel-efficient. It can also last longer. In 2019, it was tested on Chevrolet Bolt EVs, according to Chevy’s website.
Black Michelin Uptis airless tire on a red Chevrolet Bolt EV
This company started in 2005. Minnesota-based Polaris Industries (est. 1981), the world’s biggest snowmobile manufacturer, bought it in 2012, according to The Review.
Before it was acquired, the U.S. Department of Defense endowed it with a four-year grant worth $18 million to create airless tires for military use.
Resilient Technologies supply Polaris Defense, a division of Polaris Industries, with airless tires for military vehicles.
Yes, it’s legal to manufacture, distribute, purchase, and use airless tires.
The U.S. Department of Transportation issued a guideline in Standard No. 129 (“New non-pneumatic tires for passenger cars”) under the Electronic Code of Federal Regulations (e-CFR).
Per Industry Tap, Resilient Technologies indirectly said that NPTs are bulletproof. However, it explicitly stated that airless tires can survive “roadside bombs.”
Creating NPT’s or airless tires is not only about reinventing the wheel for better driving performance and for additional options on saving the environment.
It’s also about safety.
Based on a 2012 report by the U.S. National Highway Traffic Safety Administration:
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[Underinflated] Tires are 3 times as likely to be cited as critical events in the pre-crash phase.
In addition, five percent of the 3.8 million vehicle crashes (national level) happened because of tire problems (pre-crash phase).
Airless tires are basically puncture-proof and flat-proof tires that hopefully will help lessen the risk of road accidents.