Park Tool SW-13C Spoke Wrench Mavic
Comfortable, vinyl dipped, two-sided spoke wrench is designed to easily access Mavic fittings, including the Mavic SSC Ksyrium and Crossmax SLR wheels. Fits both Mavic 9mm threaded eyelets and 5.65mm integrated nipples.
I hate Mavic wheels. Still, if you must work on them from time to time, then this isn't a bad way to go. Four stars because in most cases, you don't need the amount of leverage this thing provides. A single socket thumb wrench would be easier to use. This thing will only give you half a turn before you need to reset it.