This weekend I got in a couple bike rides, both marred by equipment failures. I went mountain biking on Saturday. I found some great single-track and ran out of steam going up a gully. I cranked too hard and broke my chain. Fortunately, I was only a mile from the car. Sunday, I had a 25 mile ride according to my plan. About 3 miles from the end, I must have hit some construction debris and got a flat. It was more than the tube, the tire has a hole too.