Here's how I determined the chain length differential:
The circumference of the 22-tooth Worksman sprocket is 11-3/4 inches.
The "half-circumference", (the portion the chain runs over), is 5-7/8 inches.
The circumference of the 20-tooth NE5 sprocket is 10-1/2 inches.
The half-circumference is 5-1/4 inches.
The difference is 5/8 inch, the amount of extra chain length required FOR KEEPING THE WHEEL AXLE IN THE SAME POSITION, so the drive belt will have the same tension as before.
The chain links are spaced 1/2 inch, so adding one link will make the chain 1/8 inch too short, and adding one and a half links will make the chain 1/8" too long.
With 1-1/2 extra links and the axle in the same position as with the stock wheel, there will be a slight sag in the chain.
What...Me Worry?
HAL