GMC C20 Spare Tires

The GMC C20 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 C20 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 C20 spare tire.

1989-1989 GMC C20 Spare Tires

This generation of the GMC C20 began in 1989 and was available through 1989. All the models for these years use the same spare tire and wheel solution.

Slide Table to See More
YearMakeModelBolt
Pattern		Tire
Diameters		Recommended
Spare Tire
1989GMCC20 R2500
8x6.5"
29.3-30.5"
Full Size

1987-1988 GMC C20 Spare Tires

This generation of the GMC C20 began in 1987 and was available through 1988. All the models for these years use the same spare tire and wheel solution.

Slide Table to See More
YearMakeModelBolt
Pattern		Tire
Diameters		Recommended
Spare Tire
1988GMCC20 R20
8x6.5"
29.3-30.5"
Full Size
1987GMCC20 R20
8x6.5"
30.4-31.7"
Full Size

1973-1987 GMC C20 Spare Tires

This generation of the GMC C20 began in 1973 and was available through 1987. All the models for these years use the same spare tire and wheel solution.

Slide Table to See More
YearMakeModelBolt
Pattern		Tire
Diameters		Recommended
Spare Tire
1987GMCC20
8x6.5"
30.4-31.7"
Full Size
1986GMCC20
8x6.5"
30.4-31.7"
Full Size
1985GMCC20
8x6.5"
30.4-31.7"
Full Size
1984GMCC20
8x6.5"
30.4-31.7"
Full Size
1983GMCC20
8x6.5"
30.4-31.7"
Full Size
1982GMCC20
8x6.5"
30.4-31.7"
Full Size
1981GMCC20
8x6.5"
29.5-31.8"
Full Size
1980GMCC20
8x6.5"
29.5-31.8"
Full Size
1979GMCC20
8x6.5"
28.6-31.8"
Full Size
1978GMCC20
8x6.5"
28.6-31.8"
Full Size