I've noticed 2x spoke patterns on some MTB wheelsets and wonder about their durability. If I'm not mistaken, Stan's newest ZTR Race wheelset uses a 2-1 cross in the rear? Is that 2x on the brake side and 1x on the drive, or vice versa? And how well would something like this hold up to average cross country riding? I've always used 3x spoked wheels and see the disclaimers that disk brake manufacturers have saying to only use their brakes on 3x wheels. What gives?