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Yes, you can use a replacement tire of 175-65-r15 for a 195-55-r15 rim.
It is ok, but lessens your overall stopping capacity, - WHY would you want to do that .
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.
My 2005 PT Cruiser uses 195/65R15
My 2008 Honda Fit!
yes, you can, but they are slightly wider, and may rub a bit, check clearance first!
Yes, you can.
My 2007 Honda Fit Sport does. Acura Integra
Yes, you can use a 225-45-18 tires instead of 225-50-18 tires.
Can you? Yes, you can but I would not recommend it. By doing this you will decrease the diameter of the tire/wheel by 1". This will cause your speedometer read 2.3 mph too fast at 60 mph. Your engine will also turn 32 rpm's more at 60 mph, which will cause your vehicle to use more fuel and get less mpg. If you want to change the size to a narrower tire then go with a 195/65-15 which would be almost the same diameter. Or if you wish to go with a wider tire then a 225/55-15 will work well.
Yes, you can
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.