The largest tire that will fit on an 1986 Chevy Sportvan without any modifications is a 235/75R15. This tire size has a diameter of 30.6 inches, a width of 9.2 inches, and a sidewall height of 7.7 inches.
Largest Rim Size
The largest rim that will fit on an 1986 Chevy Sportvan without any modifications is a 15x8 inch rim. This rim has a diameter of 15 inches and a width of 8 inches.
Considerations
When choosing a tire and rim size for your 1986 Chevy Sportvan, there are a few things to keep in mind. First, make sure that the tire and rim sizes are compatible with your vehicle's specifications. Second, consider the intended use of your vehicle. If you plan on doing a lot of off-road driving, you may want to opt for a larger tire size that provides more traction. Finally, keep in mind your budget. Larger tire and rim sizes can be more expensive than smaller sizes.
Overall
The largest tire and rim size that will fit on an 1986 Chevy Sportvan without any modifications is a 235/75R15 tire on a 15x8 inch rim. However, be sure to consider your vehicle's specifications, intended use, and budget when choosing a tire and rim size.
