Rebuilding a Spoked Wheel for the Royal Enfield Bullet

Step 5 Attaching the rim

In this pic the leading edge of the wheel would be to the right. The outer spoke sets I angle up at a trailing angle. (the spoke nipple trails the hook on the hub in the direction of rotation of the wheel)
Ive seen this in a few pics of the bike and presume its to take the forces exerted under braking conditions.
Thus the inner spoke sets naturally go in the opposite direction, downward at a leading angle to the hub.