why is it that on a stock 05 ap2 the tires are not the same size hight wize? 40's in the back and 45's in the front?

 

overall diameter they are close! thats all that matters the rears should be slightly taller.

 

they are both 24.8 inches.

 

That number is a percentage that determines the sidewall height.
so for a 215/45/17:

215 = width of the tire (in millimeters)
45 = 45% of the tire width (which again is 215mm)
17 = for a 17" wheel obviously

So 215 x .45 = 96.75 (this is metric so millimeters) this is the height of the sidewall.

To calculate overall diameter it would be 96.75(x2) + 431.8mm (this is the 17" wheel size converted to MM) So you get 625.3mm, convert this to inches and it's 24.63" overall diameter for the 215/45/17 tire.
Do the math for the 245/40/17 rears and you get 24.72 inches, so nearly identical.

 

They are all correct. The height is the same front and rear.

 

NEVER new that yea they look almost identical u can see a slight diffrence but not mouch, i was just curious tho thx for the clerification

off topic: im bringin the car to honda tomaro to get the front and rear bumpers repainted i hope they do a good job, any word of advice?