[Ladhaan]

Hi,

Newbie here. I just purchased a 2018 i430 Xdrive Grand Coupe with M Sport Package. As the car comes with performance tires, I need to get winter tires. I found an awesome deal on 225 40R 18, but specs show I should be using 225 45R 18. Will this be an issue, or should I be ok with the 225 40R 18?

Thx!

[.BMW.]

I don't recommend 225/40-18.

Those tires are 3.5% shorter than OEM size and results in increased fender gap, less wheel protection, reduced comfort and a speedo that is even more off than with OEM tires.

[Ladhaan]

Originally Posted by .BMW.

I don't recommend 225/40-18.

Those tires are 3.5% shorter than OEM size and results in increased fender gap, less wheel protection, reduced comfort and a speedo that is even more off than with OEM tires.

Actually I misread. It’s 255 40r 18. Would that work?

[Buzzo]

I like to use this website comparing tire&wheel setups to OEM: http://www.rimsntires.com/specspro.jsp

[Canadian eh!]

Originally Posted by Ladhaan

Actually I misread. It’s 255 40r 18. Would that work?

It works height wise, but width will be tight on stock wheels in the front. Those tires are 1” wider -30mm- so call it 1/2” on either side of the wheel in width.

What wheels are you going to run these on?

An 8.5” or 9” wheel is a better fit for a 255 tire, but will be an issue in the front.

You are better off with a 225/45-18 all around.

Sorry

[chicagoshark]

Originally Posted by Canadian eh!

It works height wise, but width will be tight on stock wheels in the front. Those tires are 1” wider -30mm- so call it 1/2” on either side of the wheel in width.

What wheels are you going to run these on?

An 8.5” or 9” wheel is a better fit for a 255 tire, but will be an issue in the front.

You are better off with a 225/45-18 all around.

Sorry

255/40/18 on 8.5 Et35 fits on the front of a 340, I'm assuming it would on a 430.

[Ladhaan]

Originally Posted by chicagoshark

255/40/18 on 8.5 Et35 fits on the front of a 340, I'm assuming it would on a 430.

Correct, it’s a 430 GC.

[chicagoshark]

Originally Posted by Ladhaan

Correct, itÂ’s a 430 GC.

If the depth/wheel depth size is the same as a 340, then it will fit from personal experience. But my car is not the same as yours, but I think they should be similar.

I run 255/40/18 square with no problems.

[Billfitz]

Where winter tires are concerned don't go wider, as you end up with less traction. It's counter-intuitive, but true.
https://blog.tirerack.com/blog/hunte...ter-for-winter