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by OliverM 1421 days ago
Isn't dust from tyre wear a major point of concern? E.g. https://www.theguardian.com/environment/2022/jul/25/tyre-dus...
3 comments

No. That study didn’t even measure EV tire dust, they extrapolated it from weight.

Ignores that the rest of the car tends to be light weighted, etc

Also ignores that EVs universally use low rolling resistance tires, which dissipate less energy in rolling friction and thus less energy to produce tire particulates. (Rubber is also not nearly as bad as these PAHs.)

True, tire dust may not be hugely different with EVs, but tire dust is definitely a problem. https://www.theguardian.com/environment/2022/jul/25/tyre-dus...
Can they not use other kinds of tires, and/or are those a cheap kind of tire? Because otherwise I expect that most that are on the road longer than a tire change, won't be using that kind, and that'll get more true the more accessible they get—there are a not small number of people who buy used tires because they can't afford new ones, not even shitty new ones, and worn tread is better than the totally-bald tires they're replacing.
Because the car’s usefulness is much less if they get conventional car tires. Lower range is super annoying, so people just pay for the slightly more expensive low rolling resistance tires. They’re also the standard replacement tires.
It really isn't that big of a deal to use more traditional tires either. The reduction in range only matters for edge case folks that really need the last 10%. It has also been harder during the supply chain crunch to get specific tires. We went to a more traditional winter tire on my wife's Tesla and it lost like 0.1 mi/kWh (it was averaging like 2.9-3.3 mi/kWh).
Low-rolling resistance tires suck in the wintery drizzle of the PNW, so our Nissan Leaf sports rubber that is a bit more sticky. If there's a difference in range, it's small enough that our measurements don't see it.
Can't speak for evs but I did the math on low rolling resistance tyres for our diesel last time I changed them, and over the lifetime of the tyre it was dubious whether it would pay for itself in fuel savings.
What’s the relationship between car speed vs. tire wear? What about weight?

How much difference can be made by changing the road surface? Do the quieter types of road surface also reduce the amount of tire dust?

Wear is inversely related to speed because the wear comes from acceleration, not from rolling at a steady speed. Starting and stopping and turning in urban driving wears tires more than cruising down a motorway.
Rolling also incurs wear. Going at a constant speed still requires shear stress on the tires like acceleration does (to counter air resistance, etc). So reduction in air resistance can also help reduce tire wear.

EV drivers typically brake a little more gradually to maximize regeneration compared to conventional braking. Having each wheel be driven by electric motors with careful traction control can minimize tire wear as well.

If tire wear is the problem we’re trying to address, it might be a good idea to include a specific fee to address it. Related to tire composition and regular annual inspection of tires. That way wear can be minimized in an effective way. Or we develop tire tread whose wear particulates are not a major problem.

Which brings up a point: we have little to no evidence that tire particulates DO pose an actual problem, unlike PAHs, which we do have evidence for. Rubber is somewhat biodegradable already. And the wear particles may be of a size distribution that isn’t so problematic. Detection or extrapolation of existence is not evidence for a problem.

We are multiple levels removed from EVs theoretically having higher weight to actual known health problems here, and likely due to better control and lower rolling resistance, it’s likely EVs are superior.

Why would you require annual inspection of tires instead of just adding an environmental tax to new tires?

If you're worried about people dodging the tax by over-wearing the tires (I doubt this would be a significant thing), you could arrange for taxes that lead to refunding less money when people recycle tires that have less tread left.

Different car suspension setups as well as suspension wear & tear have impact on tire wear too.

Tire pressure makes quite a bit of difference too.

To humans, the exhaust of an internal combustion engine is a much bigger concern, car tire particles are comparatively heavy, so they stay lower and settle out quicker.

Of course then they get washed away and end up in rivers and oceans, and we should do something about that. Probably there are a lot of low hanging fruit for that left, simply because historically nobody cared about it, apart from the inconvenience of needing to buy new tires.