I have a 2005 nissan sentra. Tire size is 195/60 R15. I have the chance to get 2 195/65 R15 tires at a good price, and want to put them on the back, keeping the 195/60's on the front. Will this be OK? Some sites say it will mess up the ABS system. I don't know if the car even has that, though some sites say it is not standard on the Nissan. Thanks for any help.

Hi!

195(width in mm)/60(sidewall height in % of width) R15(rim diameter)

This means, a 195/60 R15 rides lower than a 195/65 R15 tire. Imagine how it would look like when you put these different tire sizes on one car. It can be done but the car will be unbalanced both mechanically and aesthetically. Remember, your car was not designed for different front and rear tire sizes unlike some sports cars.

A 2005 model will most like come standard with ABS as with most cars produced year 2001 onwards.
Just buy 1 tire size for your car. If you wish to change to another tire size, change all the tires.

Good luck!