Z4-forum.com

ad26kr wrote: ↑Fri Jan 10, 2025 4:26 pm

B21 wrote: ↑Fri Jan 10, 2025 4:15 pm 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.

B21 wrote: ↑Fri Jan 10, 2025 4:35 pm

ad26kr wrote: ↑Fri Jan 10, 2025 4:26 pm

B21 wrote: ↑Fri Jan 10, 2025 4:15 pm 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.

No harm will come to any mechanical or electrical system as the front / rear ratios of tyre circumference are identical..

As I said for insurance purposes you should declare the under width rear wheel / tyre set up..

Busterboo wrote: ↑Fri Jan 10, 2025 9:45 pm So:

1 The previous owner/someone put cheap tyres on the car, same size all round.
2 This will have caused no damage.
3 It suggests, however, that this person was either ignorant, saving money before the sale or both.
4 The 'solution' is to put good tyres of the right size on the car.
5 Then, prepare for the real problems that your E89 will have.

Pondrew wrote: ↑Fri Jan 10, 2025 3:54 pm 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!

Pondrew wrote: ↑Fri Jan 10, 2025 10:51 pm Nexen tyres are NOT cheap, Chinese 'ditchfinders'. They are perfectly good 'mid range' tyres.
We really need to ditch (pardon the pun) the 'tyre snobbery' attitude on car forums. You could be forgiven for thinking if a car doesn't have the 'latest and greatest, most expensive tyres available' that the car will slide off the road at any moment without warning. It simply isn't true.

Marcoose wrote: ↑Sat Jan 11, 2025 12:16 am OP, picking up from here ... if you lay on the ground to examine the tyres, specifically the inner and outer edges of the tyres, does it look like they're excessively worn on the edges ?

And please check the manufacturing date of each tyre. See image below. I'm with Pondoo, you're within operational range, except the rears are perhaps too small for that engine. If the tyres aren't too old, you may want to wait until the spring to get new rears.

ad26kr wrote: ↑Sat Jan 11, 2025 7:27 am I will consider change the wheel+tyre for safety.

Busterboo wrote: ↑Sat Jan 11, 2025 10:52 am

ad26kr wrote: ↑Sat Jan 11, 2025 7:27 am I will consider change the wheel+tyre for safety.

Just the tyres. Your 18" wheels suit the 35i very well (and don't crack).

ad26kr wrote: ↑Sat Jan 11, 2025 11:49 am

Busterboo wrote: ↑Sat Jan 11, 2025 10:52 am

ad26kr wrote: ↑Sat Jan 11, 2025 7:27 am I will consider change the wheel+tyre for safety.

Just the tyres. Your 18" wheels suit the 35i very well (and don't crack).

But the j-value (about 8j? 8.5j? I heard of.) of the current wheel is small that it doesn't fit the wider tyre.

simnew wrote: ↑Sun Jan 12, 2025 1:17 am ... just putting this here as an example

simnew wrote: ↑Sun Jan 12, 2025 1:17 am I changed from 19 to 18 simply to eliminate the risk of cracking (5 cracks that had ‘reappeared’) following previous repairs. Also to improve ride comfort. I used standard Goodyear F1 Eagle non run flat. But as others have said, the 3.5i with DCT did not come with 19s as standard. The 18s I bought were 8J at the front (225/40) and 8.5J at the back (255/35).

I used Alloy wheels direct and you simply put your reg in and it tells you the standard and optional sizes for all the wheels. Plenty of others to choose from as well, just putting this here as an example