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Are these Z4C front wheel arch liners iffy?

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MACK
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Are these Z4C front wheel arch liners iffy?

Post by MACK » Sat Nov 18, 2017 10:04 am

ionofchios wrote: Sat Nov 18, 2017 9:13 am
MACK wrote: Fri Nov 17, 2017 10:49 pm
ionofchios wrote: Fri Nov 17, 2017 6:03 pm Can anyone tell me if it is always obvious from a test drive if the rear springs are broken? If not, what’s the best way to check this? Getting bit paranoid after reading this forum :wink:

After I replace the front arch liners, I am planning on replacing the wheels with 18” X 8.5 225/40 fronts and 18” X 8.5 255/35 rears. Will this be fine from a clearance perspective on the front, or will I be grinding new holes in my new liners? Also, what is the correct offset (or, what is the acceptable range of offset), for 18” 8.5 rims on a Z4 Coupe 2007 3.0si?

Any advice much appreciated.

The standard 18 " wheels are 8" at the front not 8.5" but are 8.5" at the back. The standard offset is 47 front and 50 rear. The tyre sizes you mentioned are the correct z4 spec so will be fine.
As for the rear springs. I wouldnt worry too much on this front. Suplex replacements which are a like for like swap for OEM stuff are only £35-40 each. They are dead easy to fit at home too.
Thanks, guys.

With offset, is it that the greater the offset, the further inwards the wheels are? So, I should try to find options around the 45-50 range.

Does anyone know if 8.5" rims on the front are likely to cause issues? Several wheel sites are offering them as 'compatible options' for this car, even 18" X 8.5 X 42 offset, which would stick out a fair amount more than stock wheels, if I understand right.
Yes it will fit i think. There are a few wheel gurus on here who will hopefully confirm this. Have you used a site called will they fit.com it's very useful. According to that a 8.5"et42 would poke out 14.5mm. A lot of folks run anything upto about 15mm spacers on the front with standard wheels. Although some do report occasional rubbing but most seem to be fine.
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Are these Z4C front wheel arch liners iffy?

Post by Steve84N » Sat Nov 18, 2017 11:26 am

I'm on the limit of rubbing with 10mm spacers with the standard ET47 wheels. My car is lowered on Eibach springs and has about 1.4 degrees of camber. I also have uprated anti-roll bars. On the stiffest setting there was no rub but one down on the bars and it rubbed ever so slightly but has now worn a fraction off the liners so no more rubbing. Also depends how hard you drive as it only happened on very hard cornering.
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ionofchios
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Are these Z4C front wheel arch liners iffy?

Post by ionofchios » Sun Nov 19, 2017 10:13 am

Cheers! So, it sounds like I should be alright.

I dialed in the following to Will They Fit:

Old: 225/40 8" 18" 47 offset (stock BMW fronts, according to a previous post)
New: 225/40 8.5" 42 offset

It says the new wheels will stick out 11.4 mm more and will be 1.3 mm closer to the strut.

MACK, these figures are a bit different to yours. Am I doing something wrong?

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Are these Z4C front wheel arch liners iffy?

Post by ionofchios » Sun Nov 19, 2017 10:17 am

BTW, I have no particular desire to put 8.5" rims on the front - I would be happy with 8s - it Is just that the rim sites I'm familiar with don't seem to have any rims that come in both 8.5 (which I do want for the rear) and 8. They also don't seem to have any rims with more than 42 offset. Maybe there's better places out there.

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