You could, but you'd have to adjust your speedometer, and you'd also have to change your gear ratio if you wanted to maintain similar performance to what you had already.
it could explode and pop
The inside volume of the tire has not changed, so the pressure will not change.
On the tire where you put the air in the tire.
Can one put 16" tires on a Buick? It depends. If you can find rims that fit the car then any tire can be put on it. Check first to see if they are compatible with the car and the wheels will turn without rubbing. On the other hand the manufacturer recommends only certain tires and if they are not put on the car if there is an accident they could deny responsibility. In some States they have inspections and if the manufacturers recommended tire is not on the car it may not pass inspection. Most Tire businesses can answer these questions.
to clear the wider rear tire
Can you put a 215 70 r15 tire and a 215 65 r15 tire on same car
Well, they will fit on the rims and you can drive the car. You must change all four if you have an AWD vehicle or an axle set on a 2WD car. Don't even think about replacing only one tire with a different size. You will make the car unsafe and damage the running gear. You could put the smaller tire on to drive slowly and carefully to the tire store or garage. According to a tire size calculator (found in related links) your speedometer will read 3.5% faster: That is, you will be driving a couple of MPH slower than your speedometer says you are. You will change the handling characteristics of your car too. Now, if I was getting these tires for free, I might consider it but there is a reason that your car has a specified size tire. Why not use the size tire your car was designed to use?
yeah but not for long
With 15 inch wheels you can do it
The city will come around and put a boot on your car for unpaid tickets. The boot goes around the tire to prevent the tire from turning.
Could be broken motor mounts.
Putting a used tire changer in your car in case of a blown tire is a smart choice. You may want to test the tire changer if you buy it used. Having any extra equipment in your car incase of an emergancy would be beneficial.