First I ride a recumbent. It takes about 2 to 2.5 regular chains to make one chain for my bike. I ride on average 1,500 to 3,000 miles a year. I run a triple in the front and a 9 speed in the rear. I have only had to replace the chain once every 3,000 miles. How is it I can get away with doing that and yet I hear of people who have to replace their chain once every 700 miles?