Pontiac Grand Prix Spare Tire Sizes

The Pontiac Grand Prix has used 5x115mm and 5x4.75" bolt pattern variations from 1978 to 2008 along with tire diameters ranging from 25.3" to 27.2" tall. Using a temporary spare tire with a diameter close to the standard tire has many benefits, especially for modern vehicles with larger brake calipers and anti-lock brakes or traction control systems. Tire diameter as well as wheel diameter clearance have been taken into account for the specific Pontiac Grand Prix years and options. In this case, 125/80R17, 165/70R17 and 145/60R20 spare tire sizes are used to avoid vehicle components while closely matching the original tire size diameters.