2012 Toyota Prius Owners Manual - Page 1325

5-2. Steps to take in an emergency Installing the spare tire STEP 1 Remove any dirt or foreign matter from the wheel contact surface. 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. STEP 2 Install the tire and loosely tighten each wheel nut by hand by approximately the same amount. Replacing a steel wheel with a steel wheel (including a compact spare tire) Tapered portion Tighten the nuts until the tapered portion comes into loose contact with the disc wheel seat. 5 Disc wheel seat When trouble arises 467 PRIUS v_U (OM47784U)