Lexus RX 450h 2010 Owner's Manual page 605

5-2. Steps to take in an emergency
Installing the spare tire
STEP 1
Install the spare tire and loosely tighten each wheel nut by hand
STEP 2
by approximately the same amount.
Vehicles with a compact spare tire
Vehicles with a full-size spare tire
604
Remove any dirt or foreign matter
from the wheel contact surface.
Tighten the nuts until the tapered
Tapered portion
portion comes into loose contact
with the disc wheel seat.
Disc wheel
seat
Turn the nuts until the washers
Washer
come into contact with the wheel.
Wheel nut
Disc wheel
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is in
motion, causing the tire to come
off.