There is a big difference in tire sizes between small passenger cars and larger vehicles like light trucks and vans. A small tire dimension would be both a smaller diameter, and the tire would be slimmer. A 205/55R16 all-season tires for a small passenger car are 205 cm wide, while 275/65R18 all-season tires for a large SUV are 275 cm wide. You have larger rims on the SUV; here, they are 18 inches. Using the wrong dimension of tires will impact the performance. Too large tires might not even fit within the wheel well.
Larger tires will also be heavier and will impact the force needed to turn the steering wheel, negatively impacting fuel consumption. Some key instruments can also be impacted by a change in dimension, where the odometer and the speedometer can give false readings. A change is therefore not recommended as it can also impact the performance and safety when you drive. If you still go ahead with a change of dimension, you should consult a tire service station to get their opinion. If you can decrease the rim size, you can hopefully save the key instruments from false readings.
You can find what dimension your vehicle should have by reading the information from the sidewall of your tires before you change any dimension. You can also find the information in the vehicles owner’s manual or google the information based on your vehicle.
For more information regarding tires of different dimensions, visit: https://www.nokiantires.com/