Why does the tread on your bike tyres wear down over time?

The tread on bike tires wears down over time due to several factors, primarily friction and abrasion. As the tires make contact with the road, the rubber gradually erodes, leading to a decrease in tread depth. Additionally, environmental factors like heat, moisture, and exposure to UV light can accelerate wear. Regular use, riding on rough surfaces, and cornering also contribute to the deterioration of tire tread.