I always check my chain for excess stretch at around 2,000 miles. I laid out my old one, and laid the new one along the side of it to see how much the old one had stretched out. You should lay them together to make sure you break the new one at the same length as the old. The old one was 3/16th of an inch longer. This might not seem like a lot but, it is when you start talking about the extra wear it can put on your front chainrings and your cogset in the rear. I currently have over 20,000 mi. on my chainrings and my cassette. A new chain every 2,000 mi is cheap compared to what you will pay for the other drivetrain components. That 2,000. mi is based on aggressive riding, so if your riding is more laid back you might be able to get 3,000 mi. Of course with the new 11 speeds the chain plates are thinner, and you know what that means.