i'm currently running kumho ecsta asx 205/45/6 in the front and 245/50/45 in the back since they didn't have 245/45/16 for kumho ecsta asx.. i was wondering how this would affect my overall performance?

 

What size are you running?

 

lol 245/50/45... i'm actually running 245/50/16

 

You'll lower your FD and your speedo and odo will be a bit off, but otherwise you should be ok.

 

The stock rear tire is 225/50-16 with overall diameter of 24.8", the new rear tire of the size 245/50-16 will be about 25.6", the different will be 0.8" or about 3%. This will change the gear ratio and the handling of the car may be negatively effected, also it throws off the anti lock braking system. It is safer if you can stay within 1% of the original diameters.

 

If you run the front tire with the same OD, you won't throw off ABS. Even if you didn't, it still won't at 3%.