* Wheel well clearance: 26-inch wheels and tires would be far too large to fit inside the wheel wells. They would rub severely on the fenders, suspension, and other components.
* Brake caliper clearance: The larger wheels might interfere with the brake calipers.
* Suspension geometry: The significantly altered wheel diameter would dramatically change the suspension geometry, impacting handling and possibly causing damage.
* Speedometer accuracy: The larger diameter would cause the speedometer to read inaccurately.
In short, it's not just a matter of bolt pattern; the sheer size difference makes it impossible. Stick to rims within the manufacturer's specifications for your vehicle's year and model.