Wheel, 18» x 8» (45.7 cm x 20.3 cm) full - size, steel spare Spare not included with (ZW9) pickup box delete unless a spare tire is ordered. (tveauto.com)
GMC calls it «the most durable pickup box in the segment.» (autofocus.ca)
The company says, «[The] composite... offers best - in - class dent, scratch and corrosion resistance, making it the most durable pickup box in the segment.» (extremetech.com)