[Lightngsvt]

I'm curious why the 22- M240ix comes with 245/35/19 tires when spec'ed with performance wheel/tire option but the M340i when ordered with the same option only comes with 225/40/19 tires? Is this to artificially make the "small" coupe handle better than the "family sedan"?

[DanG]

Overall the tire sizes are very comparable. The 225/40/19 does have a 4 mm side height increase which should give it a little softer ride.

https://tire-calc.com/comparison/225...nd-245-35-r19/

[RM7]

225s on a sports sedan of that size is obvious corner-cutting, most likely for cost to keep overall price down. A car that heavy with that intent shouldn't have 225s. 255 would be more fitting. The problem is the wheels themselves would need to be wider, you don't want a wider tire stretching over a skinnier wheel, that creates bead roll-over and decreases sidewall stiffness for cornering, etc. The heavier the car, the more this is an issue. The manufacturers realize that 95% of people care about wheel diameter only, so they make flashy large diameter wheels and basically "who cares?" about the width and actual performance.

[xlover]

Originally Posted by Lightngsvt

I'm curious why the 22- M240ix comes with 245/35/19 tires when spec'ed with performance wheel/tire option but the M340i when ordered with the same option only comes with 225/40/19 tires? Is this to artificially make the "small" coupe handle better than the "family sedan"?

Spy shots of the m340 LCI with the performance pack look to have the 245 front tires.
This looks like a new add to take advantage of the front end grip in the chassis.