this post was submitted on 01 Oct 2023
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Fuck Cars

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[–] Izzgo@kbin.social 22 points 1 year ago (5 children)

The use of tires will be a daunting thing to change. If somehow we all managed to change to bicycles for instance, there are still tires.

[–] Facebones@reddthat.com 48 points 1 year ago

The wear is drastically different, at least.

Probably easier to develop an alternative too when it doesn't need to support two tons.

[–] Butterbee@beehaw.org 26 points 1 year ago

The amount of wear on the tires of a bicycle which let's just assume the heaviest person riding the heaviest e-bike would be a few hundred pounds wearing on the tires? Compared to several tons for an auto pressing down on 4 tires it's a LOT less.

[–] puppy@lemmy.world 23 points 1 year ago* (last edited 1 year ago) (1 children)

If a solution reduces a problem by 99% I'd say that's a damn good solution. Instead here we are, clapping and rejoicing when the car companies say the new model is 5% more fuel efficient or 3% lighter over the ongoing model.

[–] Goodtoknow@lemmy.ca 18 points 1 year ago (1 children)

The trend of most new vehicle sales are larger and heavier :(

[–] LocustOfControl@reddthat.com 4 points 1 year ago

Yup and, as the article states, electric cars are even worse.

[–] tavu@sopuli.xyz 10 points 1 year ago* (last edited 1 year ago) (1 children)

As per the quote below, a car loses about 0.08g of tread per km.

Compared to a car, a bike tyre is about the same diameter, 10% of the width (~20mm), 28% usable tread depth (~2mm), has 50% less wheels, and can travel 10% the distance (~10000km).

This suggests a (very approximate) tread loss of 0.08 * 10% * 28% * 50% / 10% = ~ 0.01g per km for bicycles.

For replacing longer car journeys less typically travelled by bicycle, rail transport is the best solution and removes the issue of tyre wear.

Quoting [deleted] in r/theydidthemath:

Using the same assumptions as above (215/60R16 tires, 7mm of tread loss over 100,000 km), I estimate the loss of tread by volume from each tire as follows:

Cylinder with a diameter of 664 mm and a height of 215 mm has a volume of 74,412 cm3. Cylinder with a diameter of 664-(2x7)=650 mm and a height of 215 mm has a volume of 71,307 cm3. The volume difference between a new and worn out tire is 3105 cm3.

Typical land to sea ratio of tires is 60-70% land, depending on the type of tire. If we go with an about average value of close to 65% tread, we get the lost rubber volume of about 2000 cm3 or 2,000,000 mm3 over a single tires lifespan.

Each revolution of a tire loses about 0,04 mm3 of tread, which, according to Wolfram Alpha, is a bit less than the volume of a medium grain of sand.

If we look at the entire car with 4 tires over a kilometer of road, we get 80 mm3 or about 0,08 grams of tread lost per car per kilometer.

[–] Nouveau_Burnswick@lemmy.world 3 points 1 year ago

Your model fails to account for weight of the tyres, which has a big impact. I can't figure out what that ratio is though.

[–] mrpants@midwest.social 3 points 1 year ago

Yeah way to not think about the problem or its multifaceted solutions at all. Just write out the first thing that pops into your head and hit post.