Why do car tires not need a tube or liquid sealant but bicycle tires do?
In: Engineering
Bike tires are incredibly thin and have microscopic holes in them that let air out if not filled with a sealant.
Vehicle tires are much thicker, comprised of multiple layers of material including rubber and steel bands, and are completely sealed.
There are no holes in them, and if there are holes in one of the layers, there’s several other layers present to create a seal.
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