All KandyBikes wheel sets are hand built with close attention to the amount and uniformity of the tension.  Optimal tensions vary due to different  materials and items being used.  All factors are taken into account when building quality wheels.  Most wheels are machine built.  These wheels aren't bad by nature, in fact there is a basic consistency and convenience afforded by quality machine set ups. What a machine cannot do is dial in the max tension while also maintaining relatively even tension throughout, also while all being true.  This is why our hand built wheels will have a stiffer feel and function, creating a faster rolling, more predictable, and more durable ride.