The Venn Var 40 TCD wide disc brake specific rims are aerodynamically optimised for gravel and wide tire use. The objective was to deliver a wheelset that is aerodynamic at large yaw angles.
Riding a bike over uneven terrain means that it is impossible to hold the wheel straight. It bounces, moves, you correct your direction to pick the best line, but you do not want to slow down. This means that your front wheel will not spend much time facing the direction that you intend to travel. The Venn Var 40 TCD was developed to make you go faster in real gravel conditions, not in a tunnel. The rim also has twice as high spoke hole strength compared to other rims in the market. This ensures that you can use your wheels in any condition without fear of damage.