19 inch tire question

[kav]

I asked this question on another site but did not get much useful information so I thought I would try here...

So as it turns out I may need some new tires sooner than I had planned on so after a little reading I have a question to ask you guys:

Stock size as you will all remember is:
Front 225 45 18 (Diameter 25.97 in)
Rear 255 40 18 (Diameter 26.03 in)

The tire size that seems most popular for the 19 inch wheels, and the ones I have ae:
Front 245 35 19 - this is (Diameter differnce of -0.85% [diameter 25.75 in])
Rear 275 30 19 - this is (Diameter differnce of +2.08% [diameter 25.49 in])

Wouldn't this tire size be better given that it will give more sidewall and be slightly bigger, but still within the allowable range of difference (often quoted as 3%)
Front 245 40 19 (Diameter differnce of +2.78% [diameter 26.71 in])
Rear 275 35 19 (Diameter differnce of +2.04% [diameter 26.57 in])

[GP20]

Go with 245/35/19 & 275/30/19. I made a mistake of putting 245/40/19 & 275/35/19 tires on my Z4M and swapped them out after 1 week. From a visual point, that set-up looks very ghetto on a small car like the Z4. From a handling perspective, the car's handling just felt weird, and lost even more nimbleness.

[kav]

Originally Posted by GP20

Go with 245/35/19 & 275/30/19. I made a mistake of putting 245/40/19 & 275/35/19 tires on my Z4M and swapped them out after 1 week. From a visual point, that set-up looks very ghetto on a small car like the Z4. From a handling perspective, the car's handling just felt weird, and lost even more nimbleness.

That is too bad. I was really hoping the larger side wall was an option. Did it rub at all? Also do you have any pictures of the car when you had those tires on?

[Matjo]

How about 235's in the front? I'm running 245/35/19 today and at full turn the tires rub. Will 235 work or will they be too thin? I would really like to get rid of the rubbing..

[Z4Kevo]

Originally Posted by kav

I asked this question on another site but did not get much useful information so I thought I would try here...

So as it turns out I may need some new tires sooner than I had planned on so after a little reading I have a question to ask you guys:

Stock size as you will all remember is:
Front 225 45 18 (Diameter 25.97 in)
Rear 255 40 18 (Diameter 26.03 in)

The tire size that seems most popular for the 19 inch wheels, and the ones I have ae:
Front 245 35 19 - this is (Diameter differnce of -0.85% [diameter 25.75 in])
Rear 275 30 19 - this is (Diameter differnce of +2.08% [diameter 25.49 in])

Wouldn't this tire size be better given that it will give more sidewall and be slightly bigger, but still within the allowable range of difference (often quoted as 3%)
Front 245 40 19 (Diameter differnce of +2.78% [diameter 26.71 in])
Rear 275 35 19 (Diameter differnce of +2.04% [diameter 26.57 in])

A 245/40R19 would most likely rub a bit or at the very least be too close for comfort imho...so your best bet is to stick with the 245/35R19 you have.

The 275/30R19 difference shown above is typed in wrong it should read -2.08%. So your best bet for the rear (in keeping with the front diff) would be 285/30R19 (-1.15%)...plus it will fill out the wheel well a little bit better.

Not sure about these tire sizes on aftermarket wheels, but this is what I am running on M3 19" Competition wheels.

Z4Kevo

[kav]

Originally Posted by Z4Kevo

A 245/40R19 would most likely rub a bit or at the very least be too close for comfort imho...so your best bet is to stick with the 245/35R19 you have.

The 275/30R19 difference shown above is typed in wrong it should read -2.08%. So your best bet for the rear (in keeping with the front diff) would be 285/30R19 (-1.15%)...plus it will fill out the wheel well a little bit better.

Not sure about these tire sizes on aftermarket wheels, but this is what I am running on M3 19" Competition wheels.

Z4Kevo

Thanks for the reply!!

I am running OEM CSL rims so the rear width should be the same as your CSL rears. You are running 285/30R19 on your rears? I was told that 285 was too wide for the rear rims and would probably rub as well - but I guess this isn't the case?