I rode my 2006 Ksyrium ES wheels (the last pair of Mavic wheels I have left) at last 20,000 miles. Now the rims are so worn they're cupped, I'm waiting for the replacement wheels. now. But they never needed truing in all that time. I think I may have had the bearings on the rear hub repacked once. Amazing hoops. That being said there are lighter wheels out there. I'm not sure they'll be that bulletproof however. We'll find out.