Toyota Prius 2011 Manual page 576

6-1. Specifications
Compact spare tire
Tire size
Spare tire inflation pressure
(Recommended cold tire
inflation pressure)
Wheel size
Wheel nut torque
576
T135/80D16 101M
60 psi (420 kPa, 4.2 kgf/cm
16  4T
76 ft•lbf (103 N•m, 10.5 kgf•m)
2
or bar)