My Mavic XM719 rim blew apart yesterday going uphill on a graded dirt road. The rear wheel was hand-built by a very reputable smith. Shimano XTR 36 hole hub laced with 14g straight gauge spokes. It was one year old with no hard knocks - almost all dirt road and pavement. I'm 190 lbs. In other words, I believe the wheel was properly built and not abused. I am grateful to Mavic that they designed their failures to occur realtively close to home . . .
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