hopefully somebody can help me, i can only find websites that will calculate old an new tyres but not front and rear.
I currently have Porsche Cup 17s on my A3 Quattro with original tyres. Front 205/50/17 (7J) and Rear 255/40/17.
I want to lower the profiles and stretch the rear tyres and i know i need to change all 4. so any help would be very much appreciated.
ideally i would like 235/40/17s or mayb 235/35/17s on the back but im not sure what size the profile would have to be on the front. I dont want to change the size that much but i dont know how to keep the circumferences the same due to not wanting to break the Haldex system on my quattro. somebody also suggested maybe going to 225/40/17 on the back but i think this would stretch the rear tyres to much. its also lowered on a weitec kit (shocks and springs)
any help would be great