I was 20 miles out in the boondocks and as I turned up a hill and stood on the pedals the rear chain broke. Luckily the cell phone worked there. It only took my wife 2 hours to complete her business and come and get me. In the meantime 50 other riders on that route had a good laugh at my expense. Who the hell carries a chain breaker? Yes, you can get a mini-tool with a chain breaker on it for an added weight penalty of only a lb.