To change, or not to change, that is the question…

[tiglon]

I would add that the tyres that M2/M3/M4 wheels come with are not ideal for a Z4 and might not fit. You may get some rubbing at the front with 255/35, and the 275/35 at the back will increase the diameter which might cause issues. Not saying it definitely won't work, but something to consider - others might be able to advise better than me.

As per your other post, it is a £1500+ investment if you don't already have tyres to put on. And, by investment, I mean money spent that you'll never get back

[Mr Tidy]

I don't know anything about the M-Performance brakes on the E89 as I haven't had an E89!

But they were fine on my E90 330i with 330mm front discs.

Although B21 suspects they may not work - perhaps the bigger caliper needs more clearance?

Hopefully someone will know!

Caught in a dilemma now my discs are 330 too. Having measured, looks to be about 30mm clearance between current 19” 326M alloy and the Performance calliper, which don’t come further forward than the wheel hub. I suspect, if these rims fitted the E90, it would fit the Z4. It’s a long way to come to get it wrong… but at the mo I can’t go anywhere in the Zed anytime soon.

Couple of pics to show my point.

If the distance wasn't so great a trial fit might be viable, but as you say it's a bit too far to find out they don't!

I bought a set of 18" E89 Style 295s on here for my previous E86 but there don't seem to be any 18s in the classifieds just now.

Good luck finding a solution.

[john-e89]

My thoughts were your cheapest option and that you like 326's Jen which I do too, but can very much understand your hesitation to go that way.

My 35i is on 235\35\19 fronts and 275\30\19 rear 437's, I 'think' the fronts maybe a little stretched and require a 245 tyre, however I have zero rubbing and that's with a 20mm drop from M sport springs, so 30mm from non M sport springs. I've also added 10mm spacers all round to clear the front spring perches on the KW coil overs and still never had a rub, front or rear, for your info.

[jenniferlouise]

I’ve been playing with the ‘willtheyfit’ configuration website, to see what happens if I were to swap on M2 style 437...
the front (8J 225/35 to 9J 255/35) adds 21mm diameter, 12.7mm equally to the width, 3% Speedo error, 10mm ride height gain and 10mm loss in the arch
the rear (9J 255/30 to 10J 275/35) adds 40mm diameter, 12.7mm equally to width, 5% Speedo error, 20mm ride height gain and 20mm loss in the arch.
That doesn’t seem too bad, but needs some tape measuring tomorrow. I am still looking for a 326 9J 19” rear too. For now, Z4 remains looking all dressed up and nowhere to go in the garage.

[Darkangelv2]

437M is a great shout -

- Vanishingly few reports of cracking on this wheel - known quality OEM items
- Substantially lighter than your current wheels, so real world performance benefit (Roughly 2KG saving per wheel!)
- Cheaper than new wheels
- They look great

[jenniferlouise]

[quote=john-e89 post_id=1916183 time=1649011039 user_id=18625

My 35i is on 235\35\19 fronts and 275\30\19 rear 437's, I 'think' the fronts maybe a little stretched and require a 245 tyre, however I have zero rubbing and that's with a 20mm drop from M sport springs, so 30mm from non M sport springs. I've also added 10mm spacers all round to clear the front spring perches on the KW coil overs and still never had a rub, front or rear, for your info.
[/quote]

This is really helpful.... just been under the Z4 and tried to measure what a 437 9J and 10J would do... the fact you say they fit with no rubbing is very encouraging, as I judge there is about 20mm clearance at a couple of places with the 326 9J (on 255/30 rubber) at the rear, so taking into account a loss of 12.7mm with a 10J (275/35) that cuts the clearances very tight!

So much so I was going to bin the idea and possibly buy two brand new (£650 ea) 326s and colour match my existing fronts (back to silver) and buy some new non run flat rubber all round. This option will be £1000 at best (£1200 on better rubber, plus the cost of front refurb). Now I’m swinging back to a full set of 437 w/ 255 and 275 35 profile rubber.

I’ve also spent today looking at 18” bmw refurbished alloys with or without tyres, to benefit from a less severe ride. again it’s circa £1200 and I’m not sure which rims would be a suitable fit...

This is so hard!!

[john-e89]

[quote=john-e89 post_id=1916183 time=1649011039 user_id=18625

My 35i is on 235\35\19 fronts and 275\30\19 rear 437's, I 'think' the fronts maybe a little stretched and require a 245 tyre, however I have zero rubbing and that's with a 20mm drop from M sport springs, so 30mm from non M sport springs. I've also added 10mm spacers all round to clear the front spring perches on the KW coil overs and still never had a rub, front or rear, for your info.

This is really helpful.... just been under the Z4 and tried to measure what a 437 9J and 10J would do... the fact you say they fit with no rubbing is very encouraging, as I judge there is about 20mm clearance at a couple of places with the 326 9J (on 255/30 rubber) at the rear, so taking into account a loss of 12.7mm with a 10J (275/35) that cuts the clearances very tight!

So much so I was going to bin the idea and possibly buy two brand new (£650 ea) 326s and colour match my existing fronts (back to silver) and buy some new non run flat rubber all round. This option will be £1000 at best (£1200 on better rubber, plus the cost of front refurb). Now I’m swinging back to a full set of 437 w/ 255 and 275 35 profile rubber.

I’ve also spent today looking at 18” bmw refurbished alloys with or without tyres, to benefit from a less severe ride. again it’s circa £1200 and I’m not sure which rims would be a suitable fit...

This is so hard!!
[/quote]

How much influence do looks have in your descision Jen...?

[jenniferlouise]

[quote=john-e89 post_id=1916183 time=1649011039 user_id=18625

How much influence do looks have in your descision Jen...?

Priority is to achieve the MoT, after which, if there remains a desire, and budget, to change the alloys (and possibly tyres), then it’s all in scope. Clearly to buy new alloys would work best if I can try a few options. Presently I can’t move the car.

I’ve had some positive news from members here on the forum that may give me an opportunity to simply replace the single damaged wheel.

I’ve slowed down to avoid rushing a big financial decision. The conversations on here are so helpful too.

[jenniferlouise]

Thank you to all that have contributed to this thread. I think I’ve made a decision and have a solution. Thanks again to the wonderful community on this forum I have managed to get a replacement, undamaged 326M alloy, which will enable me to at least get my car MoT, taxed and mobile. I will likely colour match it, and then I’ve bought some time to consider a bigger spend on new or replacement wheels all round. I’d like to drive (from Cambs) to Eastbourne and see BMAutosport so that I can try some options against the car. Something clearly I can’t do whilst it’s sat, lame, in the garage. Or, I may rediscover my love of the 326’s and simply need to part ways with RFTs as many have. I could paint them a wacky colour Thanks again. A

[B21]

I bought my Zito 935s from them..good guys

[sars]

I bought my Zito 935s from them..good guys

Yep I got my Veemann’s, the AllSeasonContacts and TPMS for the SL from them, great service and advice

[Mr Tidy]

Thanks again to the wonderful community on this forum I have managed to get a replacement, undamaged 326M alloy, which will enable me to at least get my car MoT, taxed and mobile.

That is great news.

At least now you'll be able to use your car while you reach a decision so can give it some thought instead of having any time pressure.

The 326s are certainly a great looking wheel - I think I'd be tempted to keep them and swap to non RFTs.

Anyway good luck finding a long-term solution.

[jenniferlouise]

Well, I’ve got the replacement 326M on the car and it’s passed - with flying colours - it’s MoT today. I’ll look into colour matching next week… I did think i might go all OE silver but if I can get a match to the gunmetal then I’ll prob do that. Then we will consider tyres (need to save first), as I can always transfer tyres if I change the wheels later. A

[jenniferlouise]

I’ve decided to keep the 326s, they just look great on the car. So, they are a little prone to damage, I may need to create a stockpile of rears!
Having been to see two wheel refurbishment companies local to me, I’m informed the finish I have is ‘shadow chrome’ altho neither were impressed with the current quality of finish. I’ve decided to book it in for a new refurb of all four wheels, retaining the shadow chrome but, I’m assured, will look a lot better. Colour matching one, which is possible, I’m told will stand out almost as mush as the silver does now!
Given that the OSR has had two welds, I’m now in the hunt for a replacement, undamaged, unrepaired 326M alloy from the lovely people here, having success to get the terrible NSR replacement prior to MoT…

[jenniferlouise]

Still waiting for another rear 326M alloy to pop up on the forum, in the meantime I’ve booked the Zed in at Wheel Genie in Huntingdon for a full-set refurb for a little over £300… I’ve had two assessments and both say the current ‘shadow chrome’ is a poor quality and matching the ‘new’ wheel is not going to blend in, so starting again is better and will give a better look. I hear you saying ‘of course they did’ but I’ve seen the work of WG and spoken with the boss and I’m sure they will give me a finish that exceeds what I’ve got already. Only one pal I spoke with said ‘go back to silver’…