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Two answers:
The gear ratio is 1:4 so the shaft B torque is 4 times shaft A. The speed of shaft B is 1/4 that of shaft A.
The torque is the same regardless of wheel diameter, but the tractive effort where the wheel meets the floor depends on wheel radius. A 10 inch wheel has a 5 inch radius. Since we're working is SI (metric) units, we'll need to convert to meters:
5 inches/39.37=0.127 meters
Then divide the torque by the distance to the reaction surface(radius):
40 Nm / .127 meters = 315 Newtons
315 Newtons is equal to about 70 pounds so you could tow a 70 pound load IF the coeficient of friction (Mu) is less than one. A 70 pound trailer would move easily. A 70 pound bag of doughnuts wouldn't move at all...unless the grease leaked through the bag and reduced the Mu.
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"No Wasted Motion."
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