I have several multi-tools to choose from, but my favorite is still the first one I bought, the Gerber "Cool Tool", and one of the reasons it is my first pick is the adjustable wrench on it. The Cool Tool has the adjustable head wrench (opens to 19mm), an emergency tire lever, a chain tool, Allen wrenches (sizes 4-5-6-8-10 mm), 14 & 15 mm sockets, Phillips (cross head) screwdriver, spoke wrench, and a bottle opener. Also available separately are 32, 36 and 40mm headset wrenches and a bottom bracket tool that attach to the Cool Tool wrench. I don't know if they makes them any more, as I could not find them, even on Gerber's website. They weigh about 10 ounces, or close to my second choice, the Topeak Alien. (The Alien is more MTB specific, while the Cool Tool can be used for either mountain or road bikes.)
When we were in Russia in '97, our guides from the local bike club were so impressed with the Cool Tool that we ended up giving them one of the two we had with us. Like me, they are still using it.
This message was edited by Trailpatrol on 4-8-07 @ 11:01 AM