* Wheel Well Clearance: Novas of that era have relatively small wheel wells. 20-inch rims, especially with tires of a reasonable width, would likely rub against the fenders, suspension components, or the inner wheel well.
* Backspacing: The distance between the mounting surface of the wheel and the inner lip (backspacing) needs to be correct. 20-inch wheels designed for other vehicles would likely have a different backspacing than what's appropriate for a Nova, leading to rubbing issues.
* Offset: Similar to backspacing, the offset of the wheel plays a crucial role in fitment. Incorrect offset can cause the wheel to sit too far inward or outward, leading to rubbing.
* Brake Caliper Clearance: Larger wheels can sometimes interfere with the brake calipers. While less likely to be an issue on a Nova compared to modern cars with larger brakes, it's still a possibility.
To fit 20-inch rims, you'd likely need to:
* Roll or flare the fenders: This alters the bodywork to give more clearance.
* Use significant lowering kits: Lowering the car can help, but might also worsen the handling.
* Use custom-made wheels: Wheels built specifically to fit the Nova with the desired diameter and proper offset and backspacing might be the only viable option, and likely expensive.
In short, while *technically* it *might* be possible with extensive modification, it's impractical and not recommended for a 1976 Nova SS. Sticking to wheels within the original size range or slightly larger, with careful consideration of backspacing and offset, is far more sensible.
