GMC C20 Tire Sizes by Year

• 1989 — Pick-up 2wd
• 1988 — Pick-up 2wd
• 1987 — Pick-up 2wd
• 1986 — Pick-up 2wd
• 1985 — Pick-up 2wd
• 1984 — Pick-up 2wd
• 1983 — Pick-up 2wd
• 1982 — Pick-up 2wd
• 1981 — Pick-up 2wd
• 1980 — Pick-up 2wd
• 1979 — Pick-up 2wd
• 1978 — Pick-up 2wd