I ride mostly in the local flattish woods, where the mud is silty rather than gritty, and recently the disks have done almost all the mileage, I'm also very light. I've never seen a rim come apart as you describe, but I know it happens. I know I've been lucky, but really, that short a lifespan suggests you must ride gritstone all the time. And I think EVERYONE on here does more miles than me.
