4 ms·

For sure, but you'd need big big tires to do that with a heavy truck like an EV when you can do that with a much smaller and cheaper tire with a ford maverick f

For sure, but you'd need big big tires to do that with a heavy truck like an EV when you can do that with a much smaller and cheaper tire with a ford maverick for instance.

sandworm101 4y ago
If you deflate your tires from 30psi to 20psi you will add roughly 50% more contact patch, akin to adding another axel to a two-axle car.
- xeromal 4y ago
  Yeah, already do that with my current rig.
- londons_explore 4y ago
  I'm surprised modern cars don't have automatic tyre inflators/deflators. That way, when going slow on the mud, you can go all the way down to 5 PSI for great traction. And on the highway you can go up to 40 PSI so you don't overheat the tyres or destroy the rims when you hit a stone. It could auto inflate or deflate depending on speed, terrain, and tyre temperature. And obviously a manual override for those who want ultimate control.
  - nradov 4y ago
    Some specialized vehicles such as the HMMWV (Humvee) do have such systems for enhanced off road mobility. But the necessary compressor, air lines, and sensors are complex, heavy, and prone to leaks. It's just totally impractical for regular civilian vehicles. Just stick a little portable 12V air compressor in your trunk if you expect to deflate your tires for driving on soft ground.
    - DrPhish 4y ago
      Logging trucks have this as well in some regions. The conditions for hauling can make it a requirement to just get in and out of the bush, and save wear and tear so the roads don’t get as rutted and need less maintenance in wet seasons
  - linuxftw 4y ago
    Many off road enthusiasts add onboard air compressors for this exact reason. There's no way to make this push button as there's no way to connect the compressor directly to the tire all the time, at least with anything resembling normal wheels and tires. Normal cars don't belong in the mud.
    - sandworm101 4y ago
      It isn't all that complicated. Some early hummers came with inflate-on-the-move tech. https://auto.howstuffworks.com/self-inflating-tire2.htm https://auto.howstuffworks.com/self-inflating-tire2.htm
    - mmh0000 4y ago
      That's not correct. Many vehicles have "central tire infation", which is push button[1]. [1] https://www.youtube.com/watch?v=3d9Ms9ia65I https://www.youtube.com/watch?v=3d9Ms9ia65I
  - vel0city 4y ago
    I'm not surprised modern cars don't have them, they'd add a good bit of cost to an already crazy expensive vehicle for a feature that the vast majority of people would practically never use. The vast majority of cars never leave the pavement.
    - londons_explore 4y ago
      It would probably pay for itself in reduced fuel/rolling resistance when going fast in a straight line on the highway. The design could be as simple as a $15 compressor bolted inside each wheel, powered by either the rotation of the wheels or a slipring arrangement.
      - vel0city 4y ago
        > It would probably pay for itself in reduced fuel/rolling resistance when going fast in a straight line on the highway. Just having your tires inflated right at the start of your trip does that. TPMS systems will already tell you what your tire pressure is, and with so many cars ditching the spare and going with an inflator+tire goop kit the car already has an inflator you can use. As mentioned, the vast majority of cars aren't leaving the pavement, so as long as they keep their tires inflated properly its not an issue. That little compressor inside the wheel is then adding unsprung weight, which is bad. You normally want to try and reduce that as much as possible for your suspension's sake. You'd then also need more complicated wheel assemblies. That area of the car also takes a lot of abuse with all kinds of nasty stuff kicked up in there, not exactly the place where you would want to keep an air compressor. You're also then putting this minature air compressor in the space that takes the most physical abuse in the car. You also then need a way more complicated hub design with gearing and clutches inside to properly drive the compressor when needed. This would be a way worse style of doing it compared to existing designs which just run air hoses to each hub with a central air compressor tucked away someplace safe and protected. If I had a choice between a car that just had an inflator kit in the trunk versus one with four mini air compressors and tiny transmissions and clutches in the wheel hubs along with complicated non-normal wheels and was overall more expensive, I know exactly which car I'd take every time.
eropple 4y ago
Also given that the Maverick has a hybrid option that seems to work pretty well, it's definitely a very competitive option.

For sure, but you'd need big big tires to do that with a heavy truck like an EV when you can do that with a much smaller and cheaper tire with a ford maverick for instance.

sandworm101 4y ago

If you deflate your tires from 30psi to 20psi you will add roughly 50% more contact patch, akin to adding another axel to a two-axle car.

xeromal 4y ago
Yeah, already do that with my current rig.
londons_explore 4y ago
I'm surprised modern cars don't have automatic tyre inflators/deflators. That way, when going slow on the mud, you can go all the way down to 5 PSI for great traction. And on the highway you can go up to 40 PSI so you don't overheat the tyres or destroy the rims when you hit a stone. It could auto inflate or deflate depending on speed, terrain, and tyre temperature. And obviously a manual override for those who want ultimate control.
- nradov 4y ago
  Some specialized vehicles such as the HMMWV (Humvee) do have such systems for enhanced off road mobility. But the necessary compressor, air lines, and sensors are complex, heavy, and prone to leaks. It's just totally impractical for regular civilian vehicles. Just stick a little portable 12V air compressor in your trunk if you expect to deflate your tires for driving on soft ground.
  - DrPhish 4y ago
    Logging trucks have this as well in some regions. The conditions for hauling can make it a requirement to just get in and out of the bush, and save wear and tear so the roads don’t get as rutted and need less maintenance in wet seasons
- linuxftw 4y ago
  Many off road enthusiasts add onboard air compressors for this exact reason. There's no way to make this push button as there's no way to connect the compressor directly to the tire all the time, at least with anything resembling normal wheels and tires. Normal cars don't belong in the mud.
  - sandworm101 4y ago
    It isn't all that complicated. Some early hummers came with inflate-on-the-move tech. https://auto.howstuffworks.com/self-inflating-tire2.htm https://auto.howstuffworks.com/self-inflating-tire2.htm
  - mmh0000 4y ago
    That's not correct. Many vehicles have "central tire infation", which is push button[1]. [1] https://www.youtube.com/watch?v=3d9Ms9ia65I https://www.youtube.com/watch?v=3d9Ms9ia65I
- vel0city 4y ago
  I'm not surprised modern cars don't have them, they'd add a good bit of cost to an already crazy expensive vehicle for a feature that the vast majority of people would practically never use. The vast majority of cars never leave the pavement.
  - londons_explore 4y ago
    It would probably pay for itself in reduced fuel/rolling resistance when going fast in a straight line on the highway. The design could be as simple as a $15 compressor bolted inside each wheel, powered by either the rotation of the wheels or a slipring arrangement.
    - vel0city 4y ago
      > It would probably pay for itself in reduced fuel/rolling resistance when going fast in a straight line on the highway. Just having your tires inflated right at the start of your trip does that. TPMS systems will already tell you what your tire pressure is, and with so many cars ditching the spare and going with an inflator+tire goop kit the car already has an inflator you can use. As mentioned, the vast majority of cars aren't leaving the pavement, so as long as they keep their tires inflated properly its not an issue. That little compressor inside the wheel is then adding unsprung weight, which is bad. You normally want to try and reduce that as much as possible for your suspension's sake. You'd then also need more complicated wheel assemblies. That area of the car also takes a lot of abuse with all kinds of nasty stuff kicked up in there, not exactly the place where you would want to keep an air compressor. You're also then putting this minature air compressor in the space that takes the most physical abuse in the car. You also then need a way more complicated hub design with gearing and clutches inside to properly drive the compressor when needed. This would be a way worse style of doing it compared to existing designs which just run air hoses to each hub with a central air compressor tucked away someplace safe and protected. If I had a choice between a car that just had an inflator kit in the trunk versus one with four mini air compressors and tiny transmissions and clutches in the wheel hubs along with complicated non-normal wheels and was overall more expensive, I know exactly which car I'd take every time.

eropple 4y ago

Also given that the Maverick has a hybrid option that seems to work pretty well, it's definitely a very competitive option.