after a bit more than two years, the rear wheel of my pair of Mavic Ksyrium ES (now sold as Ksyrium SL) wheels has basically completely disintegrated. the back wheel has 10 drive-side spokes, and eight of them looked like the one shown here, with severe cracking in the rim. i am surprised that none of the spokes pulled out, i was probably getting very close to that. i noticed that the back wheel became untrue, and a closer look then revealed that the complete rim was in really bad shape.
the wheel is a bit over two years old and has no more than 5000 miles on it, probably quite a bit less. i am 185lb, and i ride a forgiving carbon frame, and there is no weight limit for these wheels. i specifically bought them because everybody said that for a pair of light-weight wheel, these would be the ones to get in terms of durability. they were $1200 for the wheel-set retail price, which i consider to be expensive enough to also expect good service from a company.
my bike dealer sent the wheel to Mavic and eventually i had a lengthy conversation with the Mavic Man. to me it seemed clear that with the rim cracking almost everywhere, there must be a problem with the aluminum, maybe temperature or material issues during production. however, even though this wheel clearly did not perform as you might expect from a high-end wheel, and was showing clear signs of production problems, the Mavic Man was in no mood to compromise. it was pretty clear that he never even looked at the rim, neither.
so now i am getting a rebuild of the back wheel which replaces everything except the hub, and that costs $350. pretty expensive, but hopefully worth it. it doesn't seem to be the case that many of these wheels are failing the way mine did, so i hope the new one will last longer than the one i had. it's a great wheel to ride as long as it doesn't break. regardless of that, this was the last pair of Mavic wheels i bought (and i have bought a couple of them before, and all of them held up well). if there's enough choice, i try to avoid rewarding bad customer service.
if you also have problems with Mavic rims, please leave a comment, and if you are lucky enough to have Mavic helping you out, please let us know how you did it!