The following contribution is from Pete James.
First off, there are about 20 schools of thought and one needs to figure out which is for them, try something close, then dial it in.
From Transworld Snowboarding here are the average stances of pro riders from different snowboarding disciplines:
| Stance width | Front angle | Rear angle | Center | Board length | Notes | |
|---|---|---|---|---|---|---|
| Half-pipe | 20.7" | 17 | 2 | 0.5" back | 152.5 cm | some boarders use negative rear angles (duck-stance) |
| Freeride | 21.1" | 22 | 7 | 1.7" back | 170 cm | |
| Slalom | 17" | 49.2 | 47.2 | 0.4" back | 156.8 cm | |
| GS | 17" | 49.6 | 47.6 | 0.44" back | 164.9 cm | |
| Super G | 17.16" | 49.4 | 47.4 | 0.45" back | 170.5 cm | |
| SlopeStyle | 21.3" | 12 | 0 | 1" back | 152.9 cm | 0 rear on all riders (also known as freestyle) |
* Angles are measured from 0 degrees being straight across.
* Center is the distance back from the center of the board to the
center of the stance.