[e89 z4 35i] is it ok to use the same wheel and the same tire for front/rear

[ad26kr]

I bought a secondhand e89 z4 35i. the wheel and the tire is not the same as the default setup.

225 / 40 / 18

is it ok to maintain the current setting?

A mechanic told me a few days ago that I should return back to the default setup, since the car is RWD and DCT+N54, if the wheel is not compatible with the default setup, it may cause a fatal issue to the transmission and the differentials.

And some other guys say that if the radius of the wheel+tire is compatible, the square wheel setup is ok.

Anyone can clarify the situation?

[Busterboo]

So, the seller put fronts on the rear, too? What else did he do, I wonder?

[B21]

Several issues..

AFAIK no 35i/35is had a square set up from the factory…the 35i/35is are the most powerful of E89s and can easily overwhelm under tyred rear wheels..

The E89 is not good at tolerating mismatched tyre rolling radius..it appears normal till the stability control is required to intervene and then it MAY cause an issue..in addition it MAY cause auto /DCT issues in certain circumstances..

[ad26kr]

So, the seller put fronts on the rear, too? What else did he do, I wonder?

the original setup is front: 225 / 35 / 19, rear: 255 / 40 / 19. mine is front/rear: 225 / 40 / 18. just change the wheel and the tire, no more change in hardware.

[Busterboo]

Are they runflats, by any chance?

[ad26kr]

Are they runflats, by any chance?

i think they're not. whether runflats or not matters?

[ad26kr]

AFAIK no 35i/35is had a square set up from the factory…the 35i/35is are the most powerful of E89s and can easily overwhelm under tyred rear wheels..

The E89 is not good at tolerating mismatched tyre rolling radius..it appears normal till the stability control is required to intervene and then it MAY cause an issue..in addition it MAY cause auto /DCT issues in certain circumstances..

Someone shared me this page: https://www.wheel-size.com/size/bmw/z4/ ... ve35i--302

So, you mean that my setup (front/rear 225 / 40 / 18) is not good to auto / DCT? The factory setup is front 225 / 35 / 19, rear: 255 / 30 / 19. You can just ignore the overwhelming issue... What I concern is the damage to hardware.

[B21]

Let’s start from the top..

What is each tyre dimensions and each wheel in each location pls?

Confirm the make and model of tyre pls

Given the age , the number of original versions and subsequent changes I’m not clear what is going on..

[Pondrew]

the original setup is front: 225 / 35 / 19, rear: 255 / 40 / 19.

Nah. If 19" wheels they would be 225/35/19 front and 255/30/19 rears.

Also the width of the tyre (225 on rear) will not cause any issues on it's own. It's the rolling radius changing that could cause potential problems with DSC and mechanical drive components (unlikely for the latter TBH).

Basically the width of your tyres is irrelevant on their own.

[ad26kr]

the original setup is front: 225 / 35 / 19, rear: 255 / 40 / 19.

Nah. If 19" wheels they would be 225/35/19 front and 255/30/19 rears.

Also the width of the tyre (225 on rear) will not cause any issues on it's own. It's the rolling radius changing that could cause potential problems with DSC and mechanical drive components (unlikely for the latter TBH).

Basically the width of your tyres is irrelevant on their own.

Yes, you're right, I made a mistake. rear: 255/ 30 / 19.

So the current setup (square, front/rear 225 / 40 / 18) may cause any issue?

I found the difference between 255 / 30 / 19 and the 225 / 40 / 18 is about 0.3%, the difference between 225 / 35 / 19 and the 225 / 40 / 18 is about -0.5%. I'm not familiar with DSC and mechanical drive components, so I can't make a judgement...

[ad26kr]

Let’s start from the top..

What is each tyre dimensions and each wheel in each location pls?

Confirm the make and model of tyre pls

Given the age , the number of original versions and subsequent changes I’m not clear what is going on..

I'm new to this field, so... I'm trying to tell you the complete information that I know...please understand

car: e89 z4 35i, 2011
tyre:

(current) 225 40R18 for all 4 tyres, brand: nexen, model: opera
(default) front: 225 35R19, rear: 255 30R19

wheel: i don't know how to check the spec of the wheel, it may be not manufactured by famous brand...

[Pondrew]

OK.....
225/40/18 front is 9mm smaller circumference than a 225/35/19. So nothing. Not even 0.5%.

225/40/18 rear is 5mm larger circumference than a 255/30/19. So again, nothing. Not even 0.25%.

Nothing there should affect anything adversely on the car. The ONLY question is whether a 225mm width tyre is suitable for you car's handling/ power characteristics. I would say yes. It's just over an inch difference. I know some people say an inch is a lot, but that is a completely different subject!

[ad26kr]

OK.....
225/40/18 front is 9mm smaller circumference than a 225/35/19. So nothing. Not even 0.5%.

225/40/18 rear is 5mm larger circumference than a 255/30/19. So again, nothing. Not even 0.25%.

Nothing there should affect anything adversely on the car. The ONLY question is whether a 225mm width tyre is suitable for you car's handling/ power characteristics. I would say yes. It's just over an inch difference. I know some people say an inch is a lot, but that is a completely different subject!

So, you mean that the current setup may not affect the hardware a lot. However, the setup is not compatible to the handling / power characteristics which is related to safety issue?!

[B21]

So the good news is that all4 wheels /tyres match…general regarded maximum tolerance front / rear is regarded about 1.5% to 2%..but since yours are the same front n rear not an issue..

Looks like the previous owner cracked his alloys and replaced them with something much cheaper…

35i/35is was never sold with a square tyre set up..so technically it’s illegal as the rears are undersized relative to what BMW specified..

In addition the the reports for this tyre in the wet are hardly glowing…

So little to redeem the situation..given the power of the 35i..the undersized rear tyres and poor wet grip I hope you have adequate life insurance and litigation cover…

Reviews for Nexen Opera tyres are generally mixed, with some users praising their value for money and decent performance in dry conditions, while others criticize their lack of grip in wet weather, particularly on higher performance vehicles, and potential concerns regarding noise levels and uneven wear depending on the specific model and driving style; overall, Nexen Opera tires are often considered a mid-range option, good for budget-conscious drivers looking for adequate dry weather performance, but might not be the best choice for demanding driving situations or wet climates.
Key points about Nexen Opera tyres:
Pros:
Affordable price point
Decent dry weather grip
Can offer good mileage depending on driving conditions
Cons:
Poor wet weather performance, particularly on aggressive driving
Potential for increased road noise
May experience uneven wear in some cases

[ad26kr]

So the good news is that all4 wheels /tyres match…general regarded maximum tolerance front / rear is regarded about 1.5% to 2%..but since yours are the same front n rear not an issue..

Looks like the previous owner cracked his alloys and replaced them with something much cheaper…

35i/35is was never sold with a square tyre set up..so technically it’s illegal as the rears are undersized relative to what BMW specified..

In addition the the reports for this tyre in the wet are hardly glowing…

So little to redeem the situation..given the power of the 35i..the undersized rear tyres and poor wet grip I hope you have adequate life insurance and litigation cover…

Reviews for Nexen Opera tyres are generally mixed, with some users praising their value for money and decent performance in dry conditions, while others criticize their lack of grip in wet weather, particularly on higher performance vehicles, and potential concerns regarding noise levels and uneven wear depending on the specific model and driving style; overall, Nexen Opera tires are often considered a mid-range option, good for budget-conscious drivers looking for adequate dry weather performance, but might not be the best choice for demanding driving situations or wet climates.
Key points about Nexen Opera tyres:
Pros:
Affordable price point
Decent dry weather grip
Can offer good mileage depending on driving conditions
Cons:
Poor wet weather performance, particularly on aggressive driving
Potential for increased road noise
May experience uneven wear in some cases

tyres,,, I would change if it doesn't fit my condition. What I was most concerned about is whether the current spec of the tyres/wheel affects the condition of DSC and mechanical drive components. If they do, I want to change the wheel and the tyres ASAP. It seems like the current setup is not that harmful to the hardware, considering several post replys including yours.