Here's why:
* Wheel Well Clearance: The G20's wheel wells are designed for much smaller diameter wheels. 22-inch rims would likely rub the inner fender wells, suspension components, and possibly even the body of the van, even with a low-profile tire.
* Suspension Geometry: Larger wheels and tires significantly alter the vehicle's suspension geometry, potentially affecting handling, ride quality, and potentially causing damage to components.
* Brake Caliper Clearance: The larger diameter wheels might interfere with the brake calipers.
* Speedometer Accuracy: Changing wheel and tire size alters the speedometer's accuracy, requiring recalibration.
* Structural Integrity: The extra weight of larger wheels and tires might strain the van's suspension and axle components, reducing its lifespan.
To determine if it's even *potentially* feasible, you'd need to:
1. Measure the existing wheel and tire size: This will give you a baseline.
2. Measure the available clearance in the wheel wells: This is crucial. You need significant clearance between the tire and the wheel well at full suspension travel (both up and down).
3. Research aftermarket wheel and tire options for the G20: See what the largest diameter wheels others have successfully installed. (Note: Even the largest sizes will likely be significantly smaller than 22 inches.)
In short, while technically *possible* with extensive modifications (potentially including fender flares, suspension lift, custom brake components, and potentially even frame modifications), it's extremely impractical and likely unsafe to try to fit 22-inch rims and tires on a 1990 Chevy G20 van. The effort and cost would likely far outweigh any aesthetic benefit.
