You're supposed to have gotten a special bladed-spoke compatible wheel magnet.



I guess Mavic found a lot of people complaining that the stock magnets that come with most bike computers don't fit well on the bladed spokes. My original Ksyrium SSCs (before they split the Ksyrium line up) didn't come with a magnet. The magnet that came with my computer wouldn't fit on the bladed portion of the spokes so I mounted it just beyond the bladed section.