Originally Posted by Bike_13
Ok, sounds like a warranty issue. Take it back to where you bought it.
I agree. Its very odd that a rim would crack on the braking surface anyway unless it suffered some huge impact. These rims normally last for many years, this was likely a manufacturing defect. I've got a set with at least 40-50k miles on them and they have no cracks and work great. If your shop won't help you, try calling Mavic USA directly.