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Airless Tires Roll Towards Consumer Vehicles

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11–20 of 56 posts

Re: Airless Tires Roll Towards Consumer Vehicles

#11

Michelin has been marketing their "Tweel" ( http://www.michelintweel.com/ ) product for industrial applications for a while, and I've read a couple of articles about their trials of the Tweel on passenger vehicles. I suppose that the challenges of higher speed applications have prevented that product from appearing. Personally, I want some Mattracks :) ( https://www.mattracks.com/ )

I've seen them on construction equipment, which admittedly moves very slowly.

Re: Airless Tires Roll Towards Consumer Vehicles

#12
post #7

I am pretty happy with my run flat tires on my bmw, even after a blowout they remain normal and handling is near normal as well, plus you can drive like 100miles and 50mph to a nearest tire shop. The only downside is they are more expensive and sometimes if you cought nail close to a tire sidewall it means you I'll have to replace a tire since it's not fixable

And they ride more harshly, are less compliant, are heavier (look at how much some spend on light-weight rims; tires are even further from the center of the wheel), more expensive, can get bent / dented, and rely on finicky tire pressure monitoring systems.

Re: Airless Tires Roll Towards Consumer Vehicles

#13
post #7

I am pretty happy with my run flat tires on my bmw, even after a blowout they remain normal and handling is near normal as well, plus you can drive like 100miles and 50mph to a nearest tire shop. The only downside is they are more expensive and sometimes if you cought nail close to a tire sidewall it means you I'll have to replace a tire since it's not fixable

> if you cought [sic] nail close to a tire sidewall it means you I'll have to replace a tire since it's not fixable

That's true of traditional tyres also - internal patch repairs require a minimum distance from the sidewall.

Re: Airless Tires Roll Towards Consumer Vehicles

#14
The pneumatic tire is an awesome invention. They have the ability to cancel out imperfections in the road surface over a wide range of frequencies and amplitudes. Bicycles have traditionally used no other type of suspension.

To make a non-pneumatic tire you have to invent something equally as awesome. Normally you end up with something that produces a very rough ride.

Re: Airless Tires Roll Towards Consumer Vehicles

#15
post #8

> The series of “rigorous tests” that the company is putting its tires through are meant to prove their durability, hardness (efficiency), stability, ability to take high-speed turns (slalom), and ability to maintain their integrity at high speeds (up to 130 kilometers per hour). That's only 80 MPH. I'm interested in the no flats and potential fuel savings but I'd want to be able to travel at freeway speeds on long t…

What exactly do you consider freeway speeds?

Even in the metro ATL area which is notorious for thinking the speed limit is a suggestion, the vast majority of traffic is moving under 85 MPH.

Re: Airless Tires Roll Towards Consumer Vehicles

#16
If they can get the requisite approvals planes seem to be an ideal application of these, as burst tyres upon landing or takeoff are actually rather frequent and the shrapnel can cause extra damage... sometimes leading to catastrophic results:

https://en.wikipedia.org/wiki/Air_France_Flight_4590

Re: Airless Tires Roll Towards Consumer Vehicles

#17
Something I always wonder about is the mass. Airless tires have a lot more mass around their edges than pneumatic ones do and so at higher RPMs would seem to put more stress on both the axle and the wheel, especially when turning. That seems like a really hard problem which gas solved really well.

Re: Airless Tires Roll Towards Consumer Vehicles

#18

Michelin has been marketing their "Tweel" ( http://www.michelintweel.com/ ) product for industrial applications for a while, and I've read a couple of articles about their trials of the Tweel on passenger vehicles. I suppose that the challenges of higher speed applications have prevented that product from appearing. Personally, I want some Mattracks :) ( https://www.mattracks.com/ )

I've seen them on construction equipment, which admittedly moves very slowly.

They get rather wobbly and noisy as you reach higher speeds.

Re: Airless Tires Roll Towards Consumer Vehicles

#19
post #8

> The series of “rigorous tests” that the company is putting its tires through are meant to prove their durability, hardness (efficiency), stability, ability to take high-speed turns (slalom), and ability to maintain their integrity at high speeds (up to 130 kilometers per hour). That's only 80 MPH. I'm interested in the no flats and potential fuel savings but I'd want to be able to travel at freeway speeds on long t…

What exactly do you consider freeway speeds? Even in the metro ATL area which is notorious for thinking the speed limit is a suggestion, the vast majority of traffic is moving under 85 MPH.

https://en.wikipedia.org/wiki/Tire_code#Speed_rating

In many countries, the law requires that tires must be specified, and fitted, to exceed the maximum speed of the vehicle they are mounted on, with regards to their speed rating code (except for "temporary-use" spare tires).

I see it as a safety factor - the speed ratings of most common tires (S or T, 180 or 190 km/h) are far beyond what most people will ever drive at. If this one is only rated to 130km/h, that decreases the safety factor.

Re: Airless Tires Roll Towards Consumer Vehicles

#20

The pneumatic tire is an awesome invention. They have the ability to cancel out imperfections in the road surface over a wide range of frequencies and amplitudes. Bicycles have traditionally used no other type of suspension. To make a non-pneumatic tire you have to invent something equally as awesome. Normally you end up with something that produces a very rough ride.

A rough ride is the least of your problems. In a powered vehicle, the primary purpose of suspension is to keep you in contact with the road. If you're not in contact with the road, you're not in control; braking, steering and acceleration don't do anything if they can't react against the surface.
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