If you prefer the idea of fitting a multi-tool to your bike instead of keeping it in your back pocket then the Ratchet Rocket is the answer. It comes with mounting brackets that fit onto any tube, or it can be attached to a pair of bottle cage bosses.
The top peels back to reveal a line of Allen key sockets, though the omission of an 8mm key means that you will have to rely on your home toolkit for fixing pedals, and the 6mm Allen key isn’t deep enough for Shimano Dura-Ace top bolts.
There’s also no spoke key. Otherwise, the Ratchet Rocket handled the 10-speed chain test superbly, although you have to be careful not to overtighten small Allen key screws as there’s far more leverage on offer here than with the other tools on test. You also get a pair of aluminium tyre levers into the bargain.
