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> Using a popular family hatchback running on brand new, correctly inflated tyres, we found that the car emitted 5.8 grams per kilometer of particles. So this
by thinkcontext 7y ago
> Using a popular family hatchback running on brand new, correctly inflated tyres, we found that the car emitted 5.8 grams per kilometer of particles.
So this is based on n=1, very suspicious.
If tires really were this big a source of PM emissions then how would levels in US cities gone down through vehicle pollution control measures. Something is not adding up here.
- furtive808 7y agoAt that rate you would burn through the whole set of tires in less than 50,000km, so how is it possible? Could it be those nubs on new tires are accounting for a majority of the waste up front?
- fefe23 7y agoMaybe not all the particles come from the tyre? They could come from the road, or the brakes, or leaves / dust on the road.
- taneq 7y agoDo most people’s tyres last longer than 50k kms? Maybe I’m doing something wrong...
- landtuna 7y agoI think the 50k is to make the tires disappear
- smt88 7y agoGood tires driving on mostly paved roads should last at least 120k kms. In the US, you pay $120-200 per tire for those, but they also come with a warranty that will replace them for free if they wear out before the distance advertised.
- sokoloff 7y agoThat's not how treadwear warranties work. They're not "replace them for free"; they're pro-rated, and there are all kinds of restrictions and limitations. https://www.consumerreports.org/cro/tires/why-tread-life-warranties-are-next-to-useless https://www.consumerreports.org/cro/tires/why-tread-life-war...
- smt88 7y agoMy mistake, I was thinking of road hazard warranties
- o-__-o 7y agoYes. A high UTQG rating will mean your tires will last forever at the expense of traction, road noise, etc. The last set of tires I bought at Costco lasted 70k miles, but also increased wet stopping distance and introduced a roar to cabin noise. My latest set have a UTQG near 0 and will only last about 10k miles but they make no noise and have insane amounts of grip (think race car tire)
- Marsymars 7y agoIf you drive less and have separate summer/winter tires, it has the odd side-effect of making long-wear tires not worthwhile, as the life of the tread depth will exceed the life of the rubber due to age.
- o-__-o 7y agoI drive about 3.5k miles a year, the OEM tires would have given me 70k miles but I would have never got there. the michelin pilot sport 4s where $5 more per tire and would survive just about 7 years (i'm planning 3-4 with the occasional track day). the tradeoff was DEFINITELY worth it, but now i'm deathly afraid of potholes and road hazards lol! (after 1000 miles on the MP4S you're already more than 1/16th worn and would need to replace the entire set to keep the AWD system happy)
- aembleton 7y agoI've done 60k miles (96 kms) on my current Michelin Cross Climate tyres. The front ones are going to need replacing soon; but the rear ones are still good. That is on a 2008 Toyota Prius so not the lightest of cars.
- hef19898 7y agoSomewhere around that, yes. Unleas you kill one by accident before that. Screws and tires don't mix too well...
- 2sk21 7y agoMy guess is that particulate solution due to those emitted from tires is probably very localized near highways.
- jschwartzi 7y agoOr surface roads. Once a month I can come out and sweep 2 or 3 cups of dust off my balcony from living next to a road.
- petre 7y agoThat's 290 kg per set of tyres in 50k km. Something doesn't add up or the emissions are not linear and they go down with tyre use.
- BenjiWiebe 7y agoWorking in a tire shop I do get the feeling that the wear is highest when new.
- a3n 7y ago> So this is based on n=1, very suspicious. Maybe the article's point is to get the site's owner more testing business.
- wongarsu 7y agoMy understanding was always that tires produce a lot of particulates but they are fairly large and heavy; most of them fall out of the air very quickly. If that's true it could be true that cars emit lots of PM from tyre wear but must of it never reaches detectors and can reasonably be ignored. That doesn't necessarily invalidate the overall point: that we reduced PM from exhaust enough that other still unregulated sources are better targets for future reduction efforts.
- iso947 7y agoFall out of the air. Into the sewers. Then into the rivers, and then the sea, where they are broken up into microplastics and return in the food chain.
- manmal 7y agoFWIW, new tires rub off a lot for the first few hundred kilometers.