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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 09-06-2016, 06:38 PM
Larrick Larrick is offline
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Need new tires Need advice

The car currently has:
245/45 R 18 rear
245/40 ZR 18 front.

Can I get all the same size?
What size is preferable?

I have 2 new 235/45 R 17 tires on rims from the parts car that we have.
Can I run them on the front and just buy 2 new 18 inch for the rear?

Is that stupid?
One of the 235/45/ 17's is an R 17 and the other is a ZR 17 different manufacturers.
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  #2  
Old 09-06-2016, 07:18 PM
Larrick Larrick is offline
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Probably buy 4 new.
Would like to stay below $150 per.
Any suggestions?
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  #3  
Old 09-06-2016, 07:37 PM
edjack edjack is offline
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Go to tirerack.com. You don't state the wheel width. The max wheel width s/b no less than 90% of the tire cross-section width.
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  #4  
Old 09-06-2016, 07:45 PM
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Quote:
Originally Posted by Larrick View Post

I have 2 new 235/45 R 17 tires on rims from the parts car that we have.
Can I run them on the front and just buy 2 new 18 inch for the rear?

Is that stupid?
Yes, that is stupid. Please don't do that.
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  #5  
Old 09-06-2016, 07:56 PM
noodlesandsam noodlesandsam is offline
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This is the 530 you just got? What rims are on it? Yes, listen to tire rack suggestions. Come back here with questions.
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  #6  
Old 09-06-2016, 08:23 PM
Larrick Larrick is offline
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18 inch rims
245/45 R 18 on rear
245/40 R 18 on front

How long does it take to get tires from tire rack.
I need the tomorrow.
Only have 3 18 inch tires.
The original owner of the recently purchased car had a 17" as a spare.
He must have changed to 18" but did not buy 5 tires and an 18" rim for a spar.
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  #7  
Old 09-07-2016, 06:10 AM
BavarianE31 BavarianE31 is offline
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Hmmm... I don't see why you can't run 17s up front and 18s in the rear if you really need to. It's not ideal but it'll get you from point A to B. Just don't expect it to handle the same. If you need tires right away, go to any tire shop around and pay for it!
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  #8  
Old 09-07-2016, 06:45 AM
hbluthi hbluthi is online now
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Larrick, before you order those tires you need to get the proper sizes first. The sizes you listed are not what you need to order.

What exact wheels (picture if you do not know) are on the car in question?
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  #9  
Old 09-07-2016, 07:06 AM
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Quote:
Originally Posted by BavarianE31 View Post
Hmmm... I don't see why you can't run 17s up front and 18s in the rear if you really need to. It's not ideal but it'll get you from point A to B. Just don't expect it to handle the same.
That's just BAD advice! Don't do it!
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  #10  
Old 09-07-2016, 07:21 AM
Larrick Larrick is offline
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The wheels seem to be 18 inch rims 59388 style 47 sport.
I do not think that they are staggered.
From what I have been able to find on staggered: Fronts are 8" wide and rears are 9" wide.
The tire size on the fronts now are: 245/45 R 18
rears now are 245/40 R 18
The 45 and 40 numbers indicated height and not width, as I understand it.
So I am thinking that the rims are exactly the same front and rear.
Is that correct?
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  #11  
Old 09-07-2016, 07:27 AM
hbluthi hbluthi is online now
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Style 47 is an E46 wheel, not for the E39. The tire size won't prove whether or not a wheel is staggered. I'd have to see what wheel you have. The door jamb will tell you what size tires to use.

You do not want a diameter difference from the front and rear tires. They should be the same.

245/40/18 is the size you need on all four wheels if they are not staggered.
235/40/18 FRONT and 265/35/18 REAR are the sizes you need if they are staggered. If you want wider you can go 10mm wider on those and still be okay with the sidewall heights.
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  #12  
Old 09-07-2016, 08:16 AM
Larrick Larrick is offline
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The wheel look exactly like the wheels in your picture next to the motor cycle.
I prefer the same tires on all wheels.
Trying to keep it simple.
The spare was a 17" so the previous owner put the 18" wheels on.
I could go back to 17" wheels because I have a set on a parts car.
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  #13  
Old 09-07-2016, 09:28 AM
dkotanto dkotanto is offline
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If costs are a concern, I would use the 17" from the donor car and go with a descent but inexpensive tire. You could sell your 18" rims to recoup some or all of the new tire costs depending on the condition of the wheels. For my 530i M-Sport, I gave these Kumhos a try and so far I'm very impressed and at $297 for a set of four, it was a no brainer. I had Discount Tire price match tire rack as I need the tires immediately and I now have about 5K miles on them and I'm very pleased. I usually but Michelins but I've decided to give the Kumho's a try based on the cost and favorable reviews. No regrets so far.

http://www.tirerack.com/tires/tires....port%20Package
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  #14  
Old 09-07-2016, 09:53 AM
Larrick Larrick is offline
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I am looking at sumitomo a/s po2.
out the door for $601.75
Today and local.
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  #15  
Old 09-07-2016, 11:33 AM
Solo12 Solo12 is offline
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Quote:
Originally Posted by Larrick View Post
The wheel look exactly like the wheels in your picture next to the motor cycle.
I prefer the same tires on all wheels.
Trying to keep it simple.
The spare was a 17" so the previous owner put the 18" wheels on.
I could go back to 17" wheels because I have a set on a parts car.
Short Version
The wheels in that picture are style 37. If they are genuine OEM BMW wheels and not replicas chances are the rear wheels are wider than the fronts. Unless the po mixed and matched so you have a set of four front wheels or a set of four rear wheels.

Long Version
If they are genuine OEM BMW wheels you can figure out their size and confirm the style by finding the part number on the wheel itself. All OEM bmw wheels will have a 7 or 11 digit part number stamped on them and a wheel size. The numbers will either be on the back of the wheel or front of the wheel (near the lugs, you may have to remove the hubcap if the hubcap covers the lugs). The part number is on the back of the wheel on the style 37 see attached pic. 9Jx18 means it is a 9" wide 18" diameter wheel. IS 24 is the offset. And the number starting in 36 is the part number. Once you have the part number you can plug it into realoem to confirm it is a style 37 wheel or see if it is something else. fyi the bmw wheels that have part number's on the front of the wheel

If they are genuine BMW OEM wheels not not replicas chances are they were staggered wheel sizes from the factory. Someone could have taken four rear wheels or four front wheels and put them together as a set so you could have wheels that are all the same width. But that is not how they came as a set from BMW.
  • OEM e39 style 37 wheels were 8" wide up front and 9" wide in the rear (they would have the 74.1mm e39 specific hub bore)
  • OEM e38 style 37 wheels are more common and many e39 users use hub adapters or have the wheel hubs bored out from the more common 72.56mm common bmw to the more obscure 74.1mm e39hub bore
    • The e38 wheels were 8" wide in the front and 9.5" wide in the rear
  • OEM e34 style 37 wheels were 8" wide up front and 9" wide in the rear
  • OEM e31 wheels were 8" wide in the front and 9.5" wide in the rear

Quote:
Originally Posted by dkotanto View Post
If costs are a concern, I would use the 17" from the donor car and go with a descent but inexpensive tire. You could sell your 18" rims to recoup some or all of the new tire costs depending on the condition of the wheels.
Agree if you have genuine style 37s wheels you should be able to get quite a bit for them, especially if they are in good condition.
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Last edited by Solo12; 09-07-2016 at 11:39 AM.
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  #16  
Old 09-07-2016, 11:46 AM
hbluthi hbluthi is online now
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For the wheels in my signature...if yours are OEM wheels then they are staggered. If you still want to keep same width tire (which doesn't do you any good for rotating tires or tire life) then use the first size I said.
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  #17  
Old 09-07-2016, 02:29 PM
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Just to clarify some statements about running 17" and 18" wheel/tires at the same time.

No...it is not recommended to run this as a dedicated tire set up. BUT...it can be done (and BMW does it all the time now)...if the 17" & 18" tires have the same overall circumference.

The story that stands out in my memory is one of a BimmerBoard e38 forum member that purchased an 03 540i/6 (Euro delivery) and I remember him documenting his trip to Germany and a pic of the non MPar in the trunk and I believe he got documents from BMW during the order process that the spare would be different. If inclined, you can search on BimmerBoard (or google) "M.Wong"...he was the forum member that documented his Euro delivery 03 540i/6. He received four 18" Style 37 MPars...and the spare was a 16" (I believe) Style 48 wheel. But if you look at the door jamb for the recommended tire sizes...if you run the 16"/17"/18" sizes listed through a tire size calculator...the overall diameter/circumference will all be within 3% (+/-) each other.

My 2006 e53 came this way, too. It came with the 18" Style 153 wheels...but the spare is a 17" Style 57.

But let me also state for the record...this is a spare vs regular wheel/tire set-up. The different wheel/tire size should be a TEMPORARY set-up until you can get the same size tire remounted....and the overall diameter/circumference has to be the same (or at least within 3% of each other). If not...you can cause some serious damage with your ABS/ASC+T/DSC systems due to the wheels being out of spec with each other and causing DSC to initiate thinking that the car is in a spin due to the wheels turning at different revolutions.
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  #18  
Old 09-07-2016, 07:04 PM
Larrick Larrick is offline
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The rears are one inch wider that the fronts.
Tire shop was thinking of putting 245/40 r 18 all around but after seeing the rims
put 245/40 on front and 245/45 on rear
Thanks for all the advice.
Everything gets complicated!
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  #19  
Old 09-07-2016, 07:39 PM
hbluthi hbluthi is online now
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Tires are nothing that needs to be complicated.

The tire shop is full of idiots. No offense to you. But only an idiot "looks at the wheels and decides on the sizes" that the OEM manufacturer does NOT recommend.

Seriously, WTaF
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  #20  
Old 09-07-2016, 07:46 PM
Larrick Larrick is offline
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I do not know tires.
They ordered both sizes for me before they saw the rims.
If one rim is an inch wider than the other, how can the same size tire fit?
I believe the wheels are the "M Parallel staggered "set up.
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  #21  
Old 09-08-2016, 04:04 AM
777-300ER 777-300ER is offline
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You shouldn't go for a taller sidewall on a wider wheel. If the rears are one inch wider than the tire should be wider. I run 245/40/r18 on the front and 275/40/r18 on the back on my staggered setup.
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  #22  
Old 09-08-2016, 07:20 AM
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Quote:
Originally Posted by Larrick View Post
The rears are one inch wider that the fronts.
Tire shop was thinking of putting 245/40 r 18 all around but after seeing the rims...put 245/40 on front and 245/45 on rear
Thanks for all the advice.
Everything gets complicated!
Hopefully...the highlighted text above is a typo.

Because of the ABS/ASC+T/DSC systems...there is a minimum overall diameter/circumference specification that needs to be adhered to...and that spec is 3% (+/-).

The wheels/tires on each axle need to remain within that 3% spec...and if the tire shop sold you what you revealed to us...the rear wheels have an overall diameter/circumference that is 3.75% greater than your front axle.

If you look at your tire inflation chart (should be on your driver's door jamb)...you can see the "tire size formula" for a staggered wheel set-up that was offered in the 17" wheel option: 235/45/17 (f) & 255/40/17 (r). If you have the same size 17" wheel...then you should run 235/45/17 all around.

You can see in the images below (from a 2003 540i/6) which came with the 18" Style 37 staggered wheel option...that the tire recommendation is: 235/40/18 (f) & 265/35/18 (r).

You can google "tire size calculator" to verify this information. Even if a decision to use a different tire size than what BMW recommends...it would still be prudent to keep the 3% spec in regards to diameter/circumference...again, when the tires have a different rolling circumference...the ABS/ASC+T/DSC systems interpret this as wheel slippage or spin...and can/will engage ABS braking or other features to attempt to bring the wheel's back in to spec to prevent what it thinks is a spin or loss of traction etc.

I highly recommend going back and getting a different set of rear tires...at least something that will equal the rolling diameter/circumference of the front tires (or vice versa).

You can also use a site like www.tirerack.com to find the correct tire sizes for the wheel sizes you have mounted. You can select the recommended...or you can enter an option...in this case...you have 18" staggered wheels. TireRack will give you the correct tire size recommendations. Use that info to shop for the wide array of tires that are available. You don't have to purchase from them...but you can use the info from their site to shop locally...and many local places will price match. I know my local Discount Tire stores do.

Good luck.

The images below is from a 2003 e39 540i/6 which had the 18" staggered wheel option...thus BMW added the 18" tire size recommendation. If you run these tire sizes through a tire size calculator...and also run the tire sizes you had mounted...you can see there's a big discrepancy with your rear tire size...falling way out of spec:






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2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
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99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 09-08-2016 at 07:52 AM.
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  #23  
Old 09-08-2016, 07:26 AM
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Folks here want to help but...

Not knowing + in a rush + not doing TireRack search = problems.

Why post here if you're going to ignore the advice? ONE Internet search would give you the answer. Yet you rush to some local place that sounds like they don't know what they're doing. Have never heard of putting a taller tire in the back.

Hard to figure.
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  #24  
Old 09-08-2016, 07:36 AM
Larrick Larrick is offline
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I have to go back this morning for an alignment.
I'll see what they say.
By complicated...I mean ...why do so many BMW folk have different wheel set up?
I told them what was on the car and asked for their advice.
I cannot tell if the rims are a different width.
I do agree that they should be wider not taller is the rim is wider.
This is a tire shop that has been there for decades and is always busy.
They seem very knowledgable.
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Old 09-08-2016, 09:36 AM
hbluthi hbluthi is online now
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It is too late now, they aren't swapping those tires out for free. I'm wondering why you asked us for advice and then went completely against it?

They don't know s*** about tires except the bare minimum, I would never go back to them.



My main thought is, why did YOU question the manufacturers requirement for tire size in the first place? Since it says right on the chart in the door jamb what size tires to use.... Even the shop didn't do that, which is why they are idiots. That's not your responsibility, but it certainly surprises me that you let them put something on the car that the manufacturer recommends AGAINST.


You asked why so many people have so many different setups (when in reality it isn't that much different)...it is because people have different wheels. But if you look at all of their tire sizes and compare the diameters front to rear, they will be nearly identical. If they are not, they are doing it wrong too.
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