[manikdprsvinX5]

I have a 2021 m340 xdrive with adaptive suspension stock height with mp brakes. I'm going from 19's to 20's this spring with 9 in the front et25 and 10.5rear et 45. I used the tire size calculator and found the ideal size for xdrive is 235 35 and 285 30 but after doing extensive research on this forum I don't find anyone running this setup. Most members are running 245 35 and 275 30. My calculations fall within the 1% rule and is actually exactly 0% with exact readings on the tach so I'm just wondering if someone can double check ✔️ my calcs or tell me why no one is running this setup?

[Red_sir]

Originally Posted by manikdprsvinX5

I have a 2021 m340 xdrive with adaptive suspension stock height with mp brakes. I'm going from 19's to 20's this spring with 9 in the front et25 and 10.5rear et 45. I used the tire size calculator and found the ideal size for xdrive is 235 35 and 285 30 but after doing extensive research on this forum I don't find anyone running this setup. Most members are running 245 35 and 275 30. My calculations fall within the 1% rule and is actually exactly 0% with exact readings on the tach so I'm just wondering if someone can double check ✔️ my calcs or tell me why no one is running this setup?

I'm seeing a 0.8% difference for 235/35 and 285/30. Still less than 1% but I imagine a big stagger like that will be understeery.

245/35 and 275/30 looks like a RWD fitment.

Maybe consider 245/35 and 285/30 or square setup?