The upward-projected drops leave the rim of the wheel at the same level as the axle. You measure the height to which a drop rises from the level of the axle:
h1 = 57.0 cm.
The wet spot on the tire makes one revolution and another drop is projected upward. You measure its highest point:
h2 = 52.0 cm.
You measure the radius of the wheel:
r = 0.311 m.
Finally, you take the wheel off the bike and find its mass:
m = 0.900 kg.
Because most of the mass of the wheel is at the tire, you model the wheel as a hoop.

(Enter the frictional torque, in N · m, that you tell to the technician. Assume the positive direction is clockwise. Indicate the direction with the sign of your answer.)