Car computer and tire/wheel size change

[CWright]

This is not on my MM but on a different vehicle. I am looking at swapping a tire and wheel size. Currently the car has 215/65 R17's with 17" rims and I am going to 225/60 R18 with 18" rims. Will the computer need to be flashed or changed to reflect new tire size or will it be ok and not recognize the change?

[Zack]

This is not on my MM but on a different vehicle. I am looking at swapping a tire and wheel size. Currently the car has 215/65 R17's with 17" rims and I am going to 225/60 R18 with 18" rims. Will the computer need to be flashed or changed to reflect new tire size or will it be ok and not recognize the change?

Its a decrease of 16 revs/mile.

It will be off a mile or 2 per hour...easily changed if your X2 has the options unlocked.

It would need to be changed to 704 revs/mile

[CWright]

Its a decrease of 16 revs/mile.

It will be off a mile or 2 per hour...easily changed if your X2 has the options unlocked.

It would need to be changed to 704 revs/mile

Do you think it's worth spending the money just being two mph off. Does it really affect the car? Thanks for the info.