You can switch to a 215/50-15 or 175/60-15 if you can find any tires in these sizes. Other optional tires which are acceptable are 205/50-15 and 185/60-15 which you can find. My advice is to stick with the OEM size.
Yes, that is an acceptable swap.
175/60-15, 165/65-15, or 215/50-15
nope
No. If you want to go to the wider 55 series tire then you need to go to a size 225/55-15. A 195/55-15 would be 6.17% smaller in diameter and you never want to go beyond a 3% difference. The 225/55-15 tire would be only 0.97% smaller which is as close as you can get to the OEM size.
195/50-15 is acceptable but 205/50-15 is better. 175/60-15 is acceptable but 165/60-15 is better. Any of these will work well.
Yes, but your speedometer will be 1.35 mph off.
Of course you can but that is not a good swap. An excellent swap would be a 195/55-15.
No, definitely not. The 195/65-15 tire will be almost 8% taller and will cause the speedometer to read 55 at 60 mph. There is almost a 2" difference in overall diameter. Your handling, ride, steering, and stability will be compromised.
195/55/15 195/55/15
You can use a 195/55-15 but I would advise against it. With this swap your speedometer will show 58.8 at a true 60 mph. A much better swap would be to go with a 205/50-15. With this swap your speedometer will show 59.8 at a true 60 mph. All other factors of the tire will be almost identical to the 195 except the section width which will be .79" wider.
Any of these sizes will work well as long as there are no clearance issues. 225/55-15 215/60-15 185/70-15 Your speedometer will be off .5 mph with all three. Know that the car will handle differently with anything other than the OEM size.
Yes, you can