[Raphael X4]

Originally Posted by FlyingAlpaca

Stupid tire questions follow:

Thinking about the M-sport diff on the X4 M40i. This selection demands a "low profile" 20" tire. BMW warns that these tires could be much rougher and risks vehicle damage.

Is a non-run flat "low profile" significantly rougher than a run flat?

Can I put non-low profile tires on later?

Are the OEM 20" non-run flats (Pirellis I think?) OK in the wet?

What about winter?

Ultimately I'm trying to make a call before I order, so any input will be appreciated.

Yes low profile is likely to cause more damage if hitting a pot hole.

Run-flat results in a stiffer ride because the sidewalls of the tire are thicker so the tire can maintain shape if deflated.

Yes, you can put on non low profile tires after but need new rims. Officially M cars can go to 19" but many here put on 18" rims.

In winter run-flat and non-run-flat doesn't really affect the performance. Things like tire make/model/type and size are more important.

[FlyingAlpaca]

Originally Posted by Raphael X4

Yes low profile is likely to cause more damage if hitting a pot hole.

Non-Run-flat results in a stiffer ride because the sidewalls of the tire are thicker so the tire can maintain shape if deflated.

Yes, you can put on non-run flat after.

In winter run-flat and non-run-flat doesn't really affect the performance. Things like tire make/model/type and size are more important.

Thank you Raphael X4!

[avi66]

Originally Posted by Raphael X4

Non-Run-flat results in a stiffer ride because the sidewalls of the tire are thicker so the tire can maintain shape if deflated.

I thought run-flat tyres were stiffer than non-run flat to maintain the ability to operate without air inside.

The run-flat side wall stiffness is why some claim the ride is harsher than non run flat.

[bocabimmer]

Originally Posted by Scottatah

Can you put the car in park at speed?

I always rest my hand on the shifter and sometimes get paranoid over the possibility. Once I did something n accidentally shifted into neutral while driving. Unfortunately there’s just no where else for the non steering hand to go (other than maybe the steering wheel).

Go ahead and try and let us know the result$. I’ve shifted into neutral a few times accidentally too, but this is something you should be able to do. Hopefully the computer would prevent park. At least that’s a button you’d have to press.

[X3rd Time Is a Charm]

Originally Posted by bocabimmer

Go ahead and try and let us know the result$. I’ve shifted into neutral a few times accidentally too, but this is something you should be able to do. Hopefully the computer would prevent park. At least that’s a button you’d have to press.

Not sure that’s possible but , I know if you have the shifter to the left in sport and with your foot on the brake turn the car off . The shifter automatically goes Back to the center and car goes into park .

[ContactPatch]

Originally Posted by X3rd Time Is a Charm

Has anyone else noticed the forum site seems to be running really slow loading or is it me ??

It's really slow this morning on my end, think I will go wash the car:

[Raphael X4]

Originally Posted by avi66

I thought run-flat tyres were stiffer than non-run flat to maintain the ability to operate without air inside.

The run-flat side wall stiffness is why some claim the ride is harsher than non run flat.

Yes, I'm sorry I wrote that backwards.

[Sportstick]

Originally Posted by Scottatah

Can you put the car in park at speed?

I always rest my hand on the shifter and sometimes get paranoid over the possibility. Once I did something n accidentally shifted into neutral while driving. Unfortunately there’s just no where else for the non steering hand to go (other than maybe the steering wheel).

Putting aside the natural advice for two hands on the wheel, why not hold the wheel with your right hand and rest your left arm on the door panel armrest? That way, you’ve still given up the same amount of steering control and you can rest an arm and keep your hand away from the shifter! Bingo!

[EWL5]

Originally Posted by Scottatah

Can you put the car in park at speed?

I always rest my hand on the shifter and sometimes get paranoid over the possibility. Once I did something n accidentally shifted into neutral while driving. Unfortunately there’s just no where else for the non steering hand to go (other than maybe the steering wheel).

Sounds like you won’t like the MY25 X3 and beyond!