As with any other type of vehicle, the amount of miles a road bike tire will last will depend on a variety of factors, including the type of terrain you ride, how often you ride, and how well you take care of your bike and bike tires.
Generally, road bike tires last between 500-1000 miles, with the higher end of that range being closer to what you can expect from a high-quality tire. This number can vary greatly, however, based on the type of terrain you ride, the type of tire you choose, and your riding habits.
If you are riding on smooth, paved roads, your tires will likely last much longer than if you are riding on gravel, dirt, or other rough surfaces. The type of tire you purchase can also make a big difference; a more durable tire with thicker treads and a higher quality rubber compound will last longer than a thinner, cheaper tire.
Finally, how well you take care of your bike and its tires can make a big difference in the life of your tires. Taking the time to properly inflate your tires and check for signs of wear and tear can help keep them in good condition for a longer period of time.
In the end, there is no definitive answer to how many miles a road bike tire will last, as it will vary from rider to rider. However, if you take care of your bike and ride on the appropriate surfaces, you can expect your tires to last between 500 and 1000 miles.