Odd set Style 42s

[Space_coyote]

Hi, looking for some advice thanks!

I recently bought a set of staggered Style 42 (two-piece) wheels for my Z3. Some time after buying them as I was getting ready to put new tyres on and have them put on the car I found out they’re actually an odd set. I contacted the seller but it seems he either knew when he sold them and didn’t say anything, or he doesn’t care - I’ll keep trying but I don’t think it’ll go anywhere.

The wheels I have are 2x 8.5Jx17 rears (RS724 offset 41), 1x 7.5Jx17 front (RS723 offset 41), and the odd one is 1x 8Jx17 front (RS765 offset 47) which would have originally come off a 3-series either E36 or E46. Both the 7.5J and 8J run the same 225/45/17 tyres.

My question is although I imagine it’s not a great idea to run these two different front wheels, is there any reason I definitely shouldn’t do it (eg is it dangerous)? With the different offset and width the odd wheel should have about an extra 6mm protruding on both the inside and outside compared to the other wheel - would this rub on the suspension? I’m not sure if a spacer would be a good idea to even up the ‘look’ on both sides but in any case they’re illegal in my country.

Thanks for any help or suggestions!

 

[Ianmc]

I wouldn't be putting different size wheels on the same axel, period.

 

[BoxClever]

The car’s suspension geometry will be out because of this so best get a replacement rim as soon as possible. Or source one the same size as the odd one and run them as a staggered set. Then you can work out what spacer size you’ll need so they can reflect decent offsets.

Either way you then need to get 4-wheel alignment checked after.

 

[t-tony]

No point getting a 4 wheel alignment on a Z3 because there is nothing you can adjust at the rear. It would tell if there are any issues but if there there’s nothing you can do about it (adjustment wise, that is).

Tony.

 

[Stevo7682]

It will cause the car to pull to the one side as you are changing the vehicle track width ( but only on one side )
You may also find the steering will feel better turning one way than the other.
Stephen

 

[Space_coyote]

Thanks for all the replies guys. But I’m a little confused, because the odd rim is only half an inch (12mm) wider, but has a 6mm deeper offset so will maintain the same centre point as the other front wheel (i.e. it’ll have 6mm more on both the inside and outside, and the centre point of the odd wheel would be in the same place as if I had the correct wheel instead). So that shouldn’t change the steering geometry or track width? Note that I understand track width is the distance between the centres of the two wheels on the same axle, not the distance between the outside edges of the wheels. Also, if I’m running the same 225/45/17 tyres on both sides then the rubber in contact with the road won’t be any different side to side?

 

[137699]

No. Just no.
Forget the fact that the measurements might suggest it'll be ok - different width rims make the tyres sit differently - stretching or compressing the sidewall - meaning the way the tyre behaves one side is totally different to the other.

Have an accident and if the assessor/loss adjuster spots different rims left/right then you will almost certainly find your insurance invalidated on the spot leaving you to pay any claim personally.

100% not worth the risk & 100% dangerous to run a car like this.

 

[Richard29]

I wouldn't.

 

[Scooblitz]

How are getting this wheel to make a front pair of 8jx17 rims.

Ebay style 42

 

[Space_coyote]

How are getting this wheel to make a front pair of 8jx17 rims.

Ebay style 42

That would be awesome, and thanks for sending through the link. Unfortunately I’m in Australia so shipping will be a bit prohibitive, but I’m on the lookout locally in case something similar comes up

 

[Space_coyote]

An update and additional question - I’ve found a single RS765 for sale so could make up a matched pair for the front of my Z3. I would have preferred to make up a pair of the Z3 OEM RS723 but they’re very rare.

Can anyone tell me if the RS765 (which was OEM on some BMW e36 3-series cars, but was never OEM on Z3s) will fit ok at the front without rubbing on the suspension?

The Z3 RS723 is 17x7.5J with offset 41
The 3-series RS765 is 17x8J with offset 47

Thanks!

 

[Scooblitz]

An update and additional question - I’ve found a single RS765 for sale so could make up a matched pair for the front of my Z3. I would have preferred to make up a pair of the Z3 OEM RS723 but they’re very rare.

Can anyone tell me if the RS765 (which was OEM on some BMW e36 3-series cars, but was never OEM on Z3s) will fit ok at the front without rubbing on the suspension?

The Z3 RS723 is 17x7.5J with offset 41
The 3-series RS765 is 17x8J with offset 47

Thanks!

The RS765 should be no issues. The wheel will be around 10mm closer to the suspension strut than the RS723. Not a big amount. I would suggest opposite lock test would be a good idea incase of minor rubbing.

If not, a 5-10mm spacer will bring it back out.