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Old 12-24-2012, 03:11 PM   #11 (permalink)
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Urban EV.

Why would you need a big(ish) EV to do what you can do (and has been done for ages !) on foot, by bike, heck, even public transport whenever they're not on strike ?

Greenwashing, like the electric bikes that no-one really needs.
Making self-propelled, power-hungry vehicles out of what already were perfectie good, human powered vehicles ...

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Old 06-09-2019, 08:58 PM   #12 (permalink)
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To bump an old thread, it looks like the tweel is getting closer to a releasable product.

https://interestingengineering.com/p...m-and-michelin

Now known as "Uptis"

Last edited by samwichse; 09-15-2021 at 02:55 PM..
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Old 06-09-2019, 09:45 PM   #13 (permalink)
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2024, that sucks.
Global warming will have killed us all by then.
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Old 06-10-2019, 12:08 PM   #14 (permalink)
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We don't if the airless tires will have any specific advantages, but it is interesting to have this come up.
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Old 06-10-2019, 01:53 PM   #15 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
We don't if the airless tires will have any specific advantages, but it is interesting to have this come up.
At least earlier in development they were touting reduced rolling resistance and increased lateral stiffness.

I wonder if you brake hard, if there's a weird snap-back from all those ribs allowing the wheel to twist an inch or two?

https://smartech.gatech.edu/handle/1853/37202
Quote:
1.2.2
Rolling Resistance
The main environmental advantage to the Tweel™ is its very low rolling resistance, or the constant force required to roll a wheel at a constant speed under a certain vertical load
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Old 06-11-2019, 11:16 AM   #16 (permalink)
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Probably no worse than the spring rebound on a regular car. One would think the rebound would be engineered out
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Old 06-13-2019, 04:41 AM   #17 (permalink)
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Quote:
Originally Posted by samwichse View Post
To bump am old thread, it looks like the tweel is getting closer to a releasable product.

https://interestingengineering.com/p...m-and-michelin

Now known as "Uptis"
This part is hilarious:

Quote:
The aim is for a complete reshuffle of conventional wheels and tires, so that they are fully replaced as an assembly unit for passenger cars.
In other words: $$$!Kaching!$$$
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Old 09-14-2021, 09:29 PM   #18 (permalink)
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https://newatlas.com/automotive/mich...ess-tire-demo/

Finally they have something ready enough to drive passenger cars on.
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Old 09-15-2021, 11:46 AM   #19 (permalink)
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Quote:
Originally Posted by samwichse View Post
https://newatlas.com/automotive/mich...ess-tire-demo/

Finally they have something ready enough to drive passenger cars on.
After 4 punctures in 5 years I'm ready for airless tires.

Michelin claims

"Michelin says it will withstand much greater impacts than a regular tire and wheel, and will have a "dramatically" longer lifespan, while adding no extra rolling resistance, not feeling any different to the driver and adding only around seven percent to the weight of the wheel – less than existing run-flat tires do."

I can't see why an airless tire would last longer. Tires normal wear out due to tread wear. Given the same tread depth and rubber compound I can't see why an airless tire would wear slower than a conventional tire. Maybe they are counting longer life due to tires not failing early due to punctures?
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Old 09-16-2021, 09:37 AM   #20 (permalink)
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Quote:
Originally Posted by JSH View Post
After 4 punctures in 5 years I'm ready for airless tires.

Michelin claims

"Michelin says it will withstand much greater impacts than a regular tire and wheel, and will have a "dramatically" longer lifespan, while adding no extra rolling resistance, not feeling any different to the driver and adding only around seven percent to the weight of the wheel – less than existing run-flat tires do."

I can't see why an airless tire would last longer. Tires normal wear out due to tread wear. Given the same tread depth and rubber compound I can't see why an airless tire would wear slower than a conventional tire. Maybe they are counting longer life due to tires not failing early due to punctures?
First, I would be very careful about what Michelin claims. Don't forget, they are responsible for the TRX which left many people high and dry for tire replacements.

Second, because of the difference in the way an airless tire COULD be manufactured, the rubber COULD be quite different and not have some of the processibility issues some rubber compounds have.

For example, some retread rubber is processed using a high pressure press, so the rubber can be made stiffer, and therefore wears longer.

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