What is actually necessary for bike touring in terms of maintenance gear?
I've been cycling for about 10 years, and have put in about 30k miles in that time. During my time riding, I've experienced the following failures that required fixing:
I've never had a tire rip, a cable break, a chain break, or anything else break like a stem, seatpost, saddle, or shifters. Obviously, everyone at least knows someone who has had something crazy break at a very inopportune time. But does that mean one should carry a replacement for everything that could possible break?
I know it's always best to prepare for the worst, but what do you REALLY need as far as maintenance gear for a tour in the United States and/or Canada?