I have a B-67, which is sprung, on my LHT. I ride very upright while touring, and the springs do help when riding pot-holey back country roads. It's very heavy (30 ounces) but works for me (~160 lbs). I ride a B-17 (20 ounces) on my cross-check with the bars and seat near the same height. On paved only tours that works for me.