Just trying to get an idea on how many miles I can expect my stock chain and sprockets to last for. My bike has about 9,000 miles on it. For the most part I keep it fairly clean and well lubed, which I know is essential for long life. When I do get a new chain and sprocket set, I will probably go with a -1 +_1 for a tad bit more acceleration while keeping the rpm's at acceptable levels for highway cruising. Does anyone even keep the stock configuration come replacement time? And, how dangerous is it to have a chain break while riding?