GMC K20 Spare Tire Fitment Guide
The GMC K20 used a 8x6.5" (8x165.1 mm) bolt pattern for all models from 1973 to 1989 along with tire diameters ranging from 28.6" to 31.8" tall. Using a temporary compact spare tire with a diameter close to the standard tire has many benefits, especially for modern vehicle applications.
The tire diameter and the wheel diameter clearance have been taken into account for the specific GMC K20 years and options. In this case, it's recommended to use a Full-Size tire similar to the tires currently on your vehicle as your spare. We've provided a breakdown by vehicle generation and model specifics to help you find the correct GMC K20 spare tire.
1989-1989 GMC K20 Spare Tires
This generation of the GMC K20 began in 1989 and was available through 1989. All the models for these years use the same spare tire and wheel solution.
| Year | Make | Model | Bolt Pattern | Tire Diameters | Recommended Spare Tire |
|---|---|---|---|---|---|
| 1989 | GMC | K20 V2500 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
1987-1988 GMC K20 Spare Tires
This generation of the GMC K20 began in 1987 and was available through 1988. All the models for these years use the same spare tire and wheel solution.
| Year | Make | Model | Bolt Pattern | Tire Diameters | Recommended Spare Tire |
|---|---|---|---|---|---|
| 1988 | GMC | K20 V20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1987 | GMC | K20 V20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
1973-1987 GMC K20 Spare Tires
This generation of the GMC K20 began in 1973 and was available through 1987. All the models for these years use the same spare tire and wheel solution.
There was a facelift redesign in 1981 that changed the look of the car, but it did not have a specific impact on the spare tire size.
| Year | Make | Model | Bolt Pattern | Tire Diameters | Recommended Spare Tire |
|---|---|---|---|---|---|
| 1987 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1986 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1985 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1984 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1983 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1982 | GMC | K20 | 8x6.5" (165.1 mm) | 30.4-31.7" | Full Size |
| 1981 | GMC | K20 | 8x6.5" (165.1 mm) | 29.5-31.8" | Full Size |
| 1980 | GMC | K20 | 8x6.5" (165.1 mm) | 29.5-31.8" | Full Size |
| 1979 | GMC | K20 | 8x6.5" (165.1 mm) | 28.6-31.8" | Full Size |