I've had to replace spokes twice while on tour, and both times I was easily able to ride to a bike shop after a few minutes with the spoke wrench. I carry the cassette tool and spare spokes, just in case the bike shop is more than a day away and I can find a friendly garage owner with a large wrench. You can make a chain whip out of your bike's chain and a large pair of channellocks. And I've used an 18" pipe wrench on one of the middle cogs. It's smart to carry a spare rim strip, too, if you might be replacing the spoke nipple. It seems like I always get a spare spoke of a different gauge and I always have to replace the nipple.