[doublecross12]

Hi, I have 335 X drive f30.

Would running 255/35/19 tires on rear wheels and 235/35/19 on front be fine ?

The rims are Front 8/19 rear 8.5/19

I read stuff about Square setup but I don't know how's that possible with 8/8.5 R19 rims.

Would you suggest me to change front 235/35/19 to some other size for comfortable driving ? As I've bought the rear 255/35/19 ones just today.

I just can't seem to properly fit the tire size for 4 months already. With some sizes the car feels so imbalanced and drives roughly.

[alohasurftoad]

for x-drive with 255/35/19 rear, you need 245/35/19 or 225/40/19(recommended) up front

[doublecross12]

Originally Posted by alohasurftoad

for x-drive with 255/35/19 rear, you need 245/35/19 or 225/40/19(recommended) up front

Even though my rear rims are little wider than front ones ?

Would 225/40/19 on front still be fine or do I have to change tires to same same size as well ?

And I can't change my rims for a month at least. What would be the best front tire size with my current rims ? Not square rims.

[alohasurftoad]

Originally Posted by doublecross12

Even though my rear rims are little wider than front ones ? Would 225/40/19 on front still be fine or do I have to change tires to same same size as well ? And I can't change my rims for a month at least. What would be the best front tire size with my current rims ? Not square rims.

on your current rims, the best size combo to run is
225/40/19+255/35/19, 0.23% difference. it is the staggered OEM fitment on both RWD and X-drive.

you may also use 245/35/19+255/35/19, 1.06% difference, which reduces understeer and increases front grip, which provides better handling performance.

[doublecross12]

Originally Posted by alohasurftoad

on your current rims, the best size combo to run is
225/40/19+255/35/19, 0.23% difference. it is the staggered OEM fitment on both RWD and X-drive.

you may also use 245/35/19+255/35/19, 1.06% difference, which reduces understeer and increases front grip, which provides better handling performance.

Thanks a lot, I'll change fronts to 225/40/19 tomorrow the moment I wake up

[doublecross12]

Originally Posted by alohasurftoad

on your current rims, the best size combo to run is
225/40/19+255/35/19, 0.23% difference. it is the staggered OEM fitment on both RWD and X-drive.

you may also use 245/35/19+255/35/19, 1.06% difference, which reduces understeer and increases front grip, which provides better handling performance.

What would be the best tire pressure for given tires then with current rims and whole setup ?

[alohasurftoad]

Originally Posted by doublecross12

What would be the best tire pressure for given tires then with current rims and whole setup ?

i think OEM pressures are 32f/35r but i'd prolly start at 34f/37r and adjust + or - a few as needed/desired.