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Yes, but if you go from, lets say, a 195/70-15 then go with a 205/65-15.
Yes, you can.
the suspension tuning is changed
Any car that was manufactured and used this size tire as the OEM size. Also any car that used a 195/75-15 OEM size can use the 205/70-15 as a substitute.
They are pretty close in overall diameter as the 205 will be .3" smaller. Your speedometer will be .7 mph fast with the 205. Your engine will turn an additional 10.1 RPMs every mile driven with the 205. The 205 is a good swap if you want a wider tire.
Yes, you can.
Yes, you can.
no u cannot put a 14 inch tire on a 15 inch rim if the car calls for another size than the rims have been changed or there were other options available on your car and it doesnt have the 15 wheel option
Yes you can but you should not. If the OEM size is 195/65-15 and you want a wider tire then install 205/60-15. This will keep the overall diameter nearly the same. Installing 195/60-15 will cause the diameter to be smaller and will cause your speedometer to be off, and will effect handling, performance, and mileage adversely.
Yes, that is a common size for that car.
The standard sized tires for a 1983 Olds Cutlass Supreme are 195/75/14. However, the car can also handle 215/65/15, 205/65/15, 205/75/14.
You can but your speedometer will be off. I would use 205/60-15 instead.