2/32
When the tire tread wears down to the wear bars, the tires are ready for replacement.
When choosing replacement bicycle tires, important factors to consider include tire size, tread pattern, durability, and intended use. Make sure the tires fit your bike's wheel size, have the right tread for your riding conditions, are durable enough for your mileage, and are suitable for the type of riding you do.
More than narrow tread tires.
Minimum tread depth for all 4 tires is 2/32"
When choosing replacement bike tires, important factors to consider include tire size, tread pattern, durability, and intended use. Make sure the tires fit your bike's wheel size, consider the terrain you'll be riding on, and choose tires that are durable and suitable for your riding style.
60% tread wear.
The warranty on a set of Goodyear Allegra tires is 80,000 miles on the tread. When you purchase the tires you are given a certificate for free replacement. You should consult the shop you buy them from as this may vary from store to store.
Many tires have tread wear indicator bars molded into the tread. When the tread is worn down to where you can see a solid bar of rubber across the width of the tread, it is time to replace the tire.
I assume you mean in the tire industry - where (usually) truck tires with good side walls and structural integrity are supplied with a new layer of tread and a new lifespan. This replacement tread is vulcanized to the old core.
I assume you are referring to the tread. High grip will have a more aggressive tread design used in off-road conditions or in deep snow. They are called off-road tires or snow tires. The difference is in the tread design.
The tread on bike tires wears down over time due to a combination of factors, including friction with the road surface, regular use, and environmental conditions. As the tires make contact with various terrains, the rubber gradually erodes, diminishing the tread depth that provides grip and stability. Additionally, factors like tire pressure and riding style can influence the rate of wear. Regular maintenance and timely replacement of worn tires are essential for safety and performance.
While it is good to use tires with the same tread and sizes, it is possible to use tires with different tread patterns, though you should be careful as the performance of the two tires may be different, causing your car to be unbalanced, endangering your passengers.