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[rotarypower101]

Is there any rubbing or clearance issues at all with 225/45ZR18 with a 2008 335xi utilizing stock 8” wide wheels?


I have 2 sets of stock staggered wheels, planning on using four 8” wheels with the 225/45ZR18 t square off 2 sets of wheels by mix and match. IS that OK/ advisable ?

*edit
I have
8Jx18EH2
8-1/2Jx18EH2
not 9" wheels like I previously thought

I think the change from 40 to 45 aspect ratio increases the diameter by ~1" is that a problem?


Will these fit inside a 335xi with NO issues of rubbing full left to right lock and full suspension travel?

Looking to pick these up, any advice?


Have been told pilot sport is what I want (are these the correct ones?), looking for Great wet performance, quiet, and a smoother ride. I think these hit on those desires well? Is there a better option?

Thank you for any help!

[rotarypower101]

Wanted to add another detail, I have read this is a OK tire wheel combination, but I asked the local tire shop, and got a NO this tire size with wheel is not recommended.

Having difficulty understanding if they just read that off the screen in black and white, with little rational judgment? I trust professionals, but I like to use discretion also, and outside info is saying its fine?

Or if there is any concern with this combination in terms of any safety? I think its a bead holding to the wheel issue?

Everything I see says AOK, but I need to ask because I don't know wheels and tires...

225/45ZR18 with 9X18 wheels is perfectly fine?

[nsjames]

recommended wheel size:
7-8.5"

click on specs.

[rotarypower101]

Originally Posted by nsjames

recommended wheel size:
7-8.5"

click on specs.

Thats why the question arises, is that a "hard rule" or a “soft recommendation”
It seems I have searched and seen many people saying it works just fine with that wheel tire combination.

however I have not found a post confidently saying or supplying information there is no rubbing with stock 9x18" wheels and a 225/45ZR18 tire.

Asking to get some understanding, hopefully from solid experience, and reasoning or explanation.

The wheel is out of this recommendation by 0.5", is that not something that should not be done, or is that close enough to the recommended spec to be tolerable?

But I don’t know enough about tires and wheels to be able to make that judgment, or have the experience to know if its fine...

[nsjames]

that's what the manufacturer states.

they're not going to do anything not recommended because then the liability falls on them if it all goes wrong and you crash into a bus full of nuns.

if that's what you want, find a seedier tire place.

[rotarypower101]

Do these tires rub at all with this combination of wheels on this vehicle?

[maryjane]

Wont rub....will just look slightly "stretched"

[rotarypower101]

Originally Posted by maryjane

Wont rub....will just look slightly "stretched"

Can I ask why would they look stretched more than a stock tire that is included with the wheel?

Why would a stock tire 225/40R18 not look stretched, but a 225/45R18 would?

Aren’t they essentially identical except for how tall the sidewall is?

If the tread width is 225 and the sidewall is taller, geometrically my assumption would be they would be less stretched? Wouldn't the angle the sidewall has to deviate from the tread to the bead be less dramatic if the sidewall is taller and the tread is the same width?

I assume there is another detail I am unclear about, but that is what I am here to ask and hopefully try and understand.

Thank you.

[maryjane]

It'll look the same.....stock wheels aren't 9 wide though are they?

[rotarypower101]

Originally Posted by maryjane

It'll look the same.....stock wheels aren't 9 wide though are they?

No, you are right I checked my notes again

Wheels
8Jx18EH2
8-1/2Jx18EH2

That helps clear things up, I asked the tire guy to physically look at them, and had me measure them with a tape, they were physically 9" wide...that is clearly not how they classify them...

That is making a lot more sense why I am getting pushback for what I thought was a easy deviation from a stock tire being slightly taller...

Thank you for asking such an obvious question, I don't think I would have caught that without you asking bluntly.

[maryjane]

Ill snap a pic of a 225 40 on a 9"wide wheel...PM me a number to text it to.

[rotarypower101]

Can I ask also, how is it known those taller tires will not cause any rubbing full left to right lock and full suspension travel with a 1" larger diameter tire?

Is that from known extra clearance in the wheel well?

Is that from using a tire on that vehicle, or knowing what ranges work correctly?

Its so ambiguous to me with so little experience with them, I am confused people have a handle on all those changes.

[rotarypower101]

Originally Posted by maryjane

Ill snap a pic of a 225 40 on a 9"wide wheel...PM me a number to text it to.

Really , thank you so much!

PMing now!

So you run a 9" wheel and it works just fine?

Never had any issue with clearance?

I have had that before and want to avoid it like the plague and at all cost!

Yet I am on very rough roads like mountain roads that take a lot of weather and freezing, and MY GOD that is a rough ride, even when diligently looking for any small discontinuity in the road! And forget about small pot holes! Catch one of those in the dark and it feels like you have just destroyed your suspension.

Anything I can do to help the harshness of the ride, I would really like to pursue, but not at the cost of rubbing the tires if I can avoid that.

[rotarypower101]

Well I purchased these tires, based on what feedback I can find, and specifically people saying they work on a e92 with stock wheels.

I received a email from the seller:
>Also, because of their increased diameter, they will mess up the calibration of your onboard computer: ABS system, transmission shift, etc…).

Anyone that has more experience, are these concerns when running a tire like this with this vehicle?

I have not seen anyone/users here voicing these concerns, many are saying the change in diameter is "Good" in many ways as the speedo is calibrated closer to accurate, and the added "plushness" from more pneumatic damping are positives they noticed.

That detail would be exactly what I desire, and was hoping for.

Are any of these above potential issues negative factors that will manifest themselves if a larger diameter tire is used on this vehicle?

[Vivek.]

I run 245/35 and 265/35 on 19" on my IS (225/35 and 255/30 is factory). These are stock M3 sizes. It has absolutely no effect on ABS. Front rubs slightly on the aux radiator in the driver's front tire well (this is 335is-specific). I have the DCT which is far more particular about ratios than any other transmission and after 100 miles or so on the new tires it calibrated itself and shifts like it did previously. At first you could tell it was targeting a higher RPM on downshifts, that is now gone. Speedo is very close to accurate based on GPS verification. IIRC it reads 75 at 76mph; around town it's pretty much dead-on.

[Antetokounmpo]

This is what a 225 on a 9" wheels look like...

[rotarypower101]

Originally Posted by Vivek.

I run 245/35 and 265/35 on 19" on my IS (225/35 and 255/30 is factory). These are stock M3 sizes. It has absolutely no effect on ABS. Front rubs slightly on the aux radiator in the driver's front tire well (this is 335is-specific). I have the DCT which is far more particular about ratios than any other transmission and after 100 miles or so on the new tires it calibrated itself and shifts like it did previously. At first you could tell it was targeting a higher RPM on downshifts, that is now gone. Speedo is very close to accurate based on GPS verification. IIRC it reads 75 at 76mph; around town it's pretty much dead-on.

Thank you, good input.

Mine is a manual, so I assume this has even less of an issue with any systems having an issue?

[rotarypower101]

Originally Posted by Antetokounmpo

This is what a 225 on a 9" wheels look like...

Thank you, I made a mistake above, apologies, my wheels are the stock 8", not 9"

And the fundamental issue I am trying to find help for is if the aspect ratio of 45 VS 40 making the wheel ~1" taller in diameter will create any issues with rubbing.

Apologies if I have not made that clear in my nativity with wheels and tires.

[rotarypower101]

I lifted my car up and physically inspected for manual clearance on both sides.

It appears to have the necessary room to fit in there and some room to spare, but I can't compress the suspension all the way to full compression while turning the wheels to full lock.

So at the top of the suspension range, I cant physically inspected or make any judgment call if it "should work", and not rub at full compression combined with steering lock.

If anyone knows about rubbing with a 225/45R18 with stock wheels, I still need some experienced help with that question.

[Vivek.]

Originally Posted by rotarypower101

Thank you, good input.

Mine is a manual, so I assume this has even less of an issue with any systems having an issue?

Yeah if you have a manual there is no affect on the transmission with different tire sizes, since your foot rather than a computer is targeting the RPMs.

Originally Posted by rotarypower101

I lifted my car up and physically inspected for manual clearance on both sides.

It appears to have the necessary room to fit in there and some room to spare, but I can't compress the suspension all the way to full compression while turning the wheels to full lock.

So at the top of the suspension range, I cant physically inspected or make any judgment call if it "should work", and not rub at full compression combined with steering lock.

If anyone knows about rubbing with a 225/45R18 with stock wheels, I still need some experienced help with that question.

It's incredibly unlikely you'll ever hit full compression and full lock at the same time...

[rotarypower101]

Originally Posted by Vivek.

It's incredibly unlikely you'll ever hit full compression and full lock at the same time...

Yeah, that is understood, but the possibility exists, and I would like to know if rubbing exist if it were to ever be at that position, that is the only way I can assess how much of an issue it "could be".

I know it is a rare possibility to have that extreme of a suspension and steering input , but it tells me if it can or can not, and if it can maybe then I can determine by how much, and this would help me rationalize where and how that would ever be an issue for me how and where I drive.

Does anyone have advice how to compress suspension if an empirical measurement were desired? Is there possibly a common solution most already have kicking around to compress suspension and still be able to fully utilize steering through its sweep? I was thinking maybe a spring compressor if it were just right it might not get in the way while testing, or perhaps even a heavy ratchet strap. would a HD strap even work for that task safely?

Does anyone happen to know from experience what typical suspension travel on these vehicles are? I think the AWD versions have a bit extra ride height, was never clear if that was just offset to give the ride height and same travel, or increased travel, or just preload?

[nick46]

Put the steering on full lock. Jack the car up until the front wheel is off the floor and then use another jack and put under the front wheel and jack it up until the suspension is fully compressed.