1993 Buick Riviera Owner's Manual - Page 214

Now put all the equipment back securely the trunk. in Compact Spare Tire Although the compact spare was fully inflated when your vehicle was new, it can lose after a time. Check air 60 the inflation pressure regularly. It should be psi (420 kPa). The compact spare is made go up to 3,000 miles to (5000 km), so you can finish yourtrip and have your full-size tire repaired or replaced where want. Of you course, it's best to replace your spare with a full-size tire as soon as you can. Your spare will last longer and be in good shape in case you needagain. it Your anti-lock brake system warning may comeon light when you are driving with a compact spare. See "Anti-Lock Brake System Warning Light" in the Index. 212