Just got some new wheels for my stang, 18 x 10 for the rear and 18 x 9 for the front, i have gone with 285 x 35 for the rear and 265 35 for the front, then i had a thought!, have checked my tyres on a tyre size calculator and found that i am running 1.5 mph difference between the front and rears, can this cause me any problems, such as gearing?

 

it doesnt matter. your wheels are not moving at different speeds. thats refering to the wheels that speed readings are taken from compared to how fast you are actually going.

 

Tires*

You won't have any issues.