[dcohen13]

(don't hate haha) Before picking up my F90 M5 comp, I was also considering the e63s. I saw the e63s runs a 265/35/20 front and 295/30/20 rear.

While just playing around with all possible tire size options, do you think it would be possible to run:

265/35/20
305/30/20

Granted I am not committed to this by any means, but I wanted to see if anyone has actually made this happen, or can confirm that it will not damage the transfer case or drivetrain? I am currently 275/35/20 squared on custom spec'd wheels.

Stats on difference can be seen here:
https://tiresize.com/comparison/

[pbonsalb]

The front to rear difference looks fine. Speedo might read high due to the smaller circumferences.

[dcohen13]

Originally Posted by pbonsalb

The front to rear difference looks fine. Speedo might read high due to the smaller circumferences.

Okay, so due to difference, this should not cause any damage? I appreciate the info on the speedo, didn't even think about that.

[LouK]

Any reason you want to go down a size in the front?

[Boiler Up!]

Possible? Sure, but why? The front end biased weight distribution of the F90 delivers a tendency to under steer with factory tire sizes. Increasing the 10mm stagger to 40mm will exacerbate this tendency.

[dcohen13]

Originally Posted by LouK

Any reason you want to go down a size in the front?

Honestly, just based on the tire sizes that my company currently makes. I am running a 275/35/20 with altered wheel offsets to make it work on our tires. I believe the 275/35/20 with a 305/30/20 would be too much a gap and cause issues with the differential.

305/30ZR20
255/30ZR20
245/30ZR20
315/35ZR20
245/35ZR20
265/35ZR20
275/35ZR20
325/25ZR21
355/25ZR21
305/30ZR21
325/30ZR21
265/35ZR21
245/35ZR19

[pbonsalb]

One thing I like about the Michelin (and Continental) tires is that they are typically up to several lbs lighter than other brands, in the high performance model tires (PS4, PSS, EC, ECS).

[Boiler Up!]

Originally Posted by dcohen13

Honestly, just based on the tire sizes that my company currently makes. I am running a 275/35/20 with altered wheel offsets to make it work on our tires. I believe the 275/35/20 with a 305/30/20 would be too much a gap and cause issues with the differential.

305/30ZR20
255/30ZR20
245/30ZR20
315/35ZR20
245/35ZR20
265/35ZR20
275/35ZR20
325/25ZR21
355/25ZR21
305/30ZR21
325/30ZR21
265/35ZR21
245/35ZR19

If you're going to pick exclusively from this list of sizes I'd keep with your square setup on 275/35r20. You may give up a little in straight line acceleration, but have a much better balanced car when turning.

[dcohen13]

Originally Posted by Boiler Up!

If you're going to pick exclusively from this list of sizes I'd keep with your square setup on 275/35r20. You may give up a little in straight line acceleration, but have a much better balanced car when turning.

I think that is what I am going to do...thanks for the input!