HiCustomer Thank you for asking your question on Just Answer.
The first number in the tire numbers indicates the width of the tire at its widest part.
The last part of the number (which is the same on both numbers you gave) it the diameter of the wheel/tire. This is the only number that might cause a change in your speedometer.
So you will NOT have any change in your speedometer, and the tires should fit on your standard rims.
Take Care, Greg A.
Using an online tire size calculator this tire size change will only make a 1.901 miles per hour to slow difference in the speedometer and odometer . The tire sizes breakdown like this for the stock tire 255millameter wide at the tread the side wall is 75% the width of the tread and the rim diameter is 16inches / the replacement tire is 265 millameter wide at the tread the sidewall is 75% as tall as the tread is wide and the rim diameter is 16 inches/ Hope this helps if so please accept and thank you for using justanswer.com james