What bolt pattern is for a 1987 Chevy?

The bolt pattern for a 1987 Chevy typically depends on the specific model, but most common configurations for full-size models like the Chevy C/K series are 5x5 inches (or 5x127 mm) for the 1/2-ton trucks and 6x5.5 inches (or 6x139.7 mm) for the heavier models. It's always best to verify the exact specifications for your particular vehicle model and trim, as there can be variations.