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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > What do you think of these wheels?



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      10-31-2005, 06:47 PM   #1
e90im
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What do you think of these wheels?

http://cgi.ebay.com/ebaymotors/18-BM...7188QQtcZphoto
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      10-31-2005, 06:52 PM   #2
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If they fit, go for it, I think they're nice on the E90.
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      10-31-2005, 08:32 PM   #3
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find the 19" wheels it will look much much better in that style
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      10-31-2005, 08:45 PM   #4
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Sweet! :rocks:
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      10-31-2005, 09:40 PM   #5
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Quote:
Originally Posted by e90im
The centerbore on the wheels you referenced is 74mm which is larger than those on an e90. The e90 centerbore is 72.5. This means that you will need something to align the wheel exactly with the hub. Without this you may get the wheel to mount but you are likely to get vibration since you won't get perfect alignment between the wheel and the hub. I would stay away from these wheels.
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      10-31-2005, 11:50 PM   #6
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I would rather get this for the same price:

http://cgi.ebay.com/ebaymotors/18-BM...7918QQtcZphoto
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      11-04-2005, 12:38 AM   #7
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Quote:
Originally Posted by Pretender
I would rather get this for the same price:

http://cgi.ebay.com/ebaymotors/18-BM...7918QQtcZphoto
I'm very tempted to get these but wondering if they'd look good on my black sapphire e90? Anybody has a picture of these wheels on a black e90?
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      11-13-2005, 09:59 PM   #8
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I just ordered those off ebay in 19". Specifically what do I need to do so they will fit? Or should I send them back and pay the restocking fee?
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      11-13-2005, 10:00 PM   #9
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http://cgi.ebay.com/ebaymotors/18-BM...7188QQtcZphoto
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      12-08-2005, 02:35 PM   #10
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Centering is no problem.

Centering the wheel is done by the 5 wheel nuts and studs which bolt the wheel to the calipre assembly. Not the 72mm hub as suggested. The people that manufacture these wheels would not make such an error. if you like the replica M5 buy them.
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      12-08-2005, 03:08 PM   #11
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The BMW wheel is hub centric, this means that the wheel and hub center must be of the same size for the wheel to fit CORRECTLY. The correct hub centric bore for the E90 is 72.5mm not the 74mm used on the 5 series cars. If you purchase these wheels you also have to purchase hub centric rings or adapters for the 74mm to 72.5mm. If you talk to your BMW service manager he/she will tell you it is not a good idea to use the adapter rings.
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      12-08-2005, 03:27 PM   #12
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Quote:
Originally Posted by HUNTER
Centering the wheel is done by the 5 wheel nuts and studs which bolt the wheel to the calipre assembly. Not the 72mm hub as suggested. The people that manufacture these wheels would not make such an error. if you like the replica M5 buy them.
Pwew, you are clearly gambling your life if you ignore perfect fit of the hub!!!!

Get 72,5 mm and drive save
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      12-14-2005, 04:15 PM   #13
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True Hub Concentric wheels use a taper and spline with one central fixing as in F1 etc and a few exotic road cars. The “taper” is used so as the different coefficient of expansion of the materials, here the wheel in aluminum and hubs in steel remain in contact. With the wheel stud/bolt method it’s the load on the stud which homologates the wheel and hub into one unit. The point being there HAS to be a clearance between wheel and hub in the centre area to which we are all referring. If there were not the continual fluctuating temperature due to braking and cooling would cause interference and non interference fits which over time would crack the weaker material usually aluminum wheels. Most vehicle makers never even machine this area only fettle the casting, machining only the bearings housing recess and the stud location holes. Further to that when preparing a car for racing this one place where metal is removed to lower the unsprung weight! BMW technicians who are usually receive 2 months at the factory and maybe have and mechanics ticket will tow the company line.

G. Hunter. A.M. Inst.Mech.Eng. Bsc. With 40 years experience in design including 7 years of racing single seaters and saloons I appreciate your concern but you’re talking rot.

If you still think your right, make your views known to the major European manufacturer to which we are all referring and think you’ll have a libel suite to deal with.
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      12-15-2005, 03:36 AM   #14
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1.
Quote:
Originally Posted by HUNTER
...BMW technicians who are usually receive 2 months at the factory and maybe have and mechanics ticket will tow the company line.


2. Thank you for clearing things up and correcting me.

3. Tell me then with your 40 years experience in design including 7 years of racing single seaters and saloons in mind:

Why does every single car manufacturer raise unsprung weights and build hubs with centrings and even in different diameters? Why are wheels produced with fitting centre bores then? To make wheel changing easier?

Please explain to an unillumined MBA.
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      12-16-2005, 02:42 PM   #15
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Dante Quote “Why does every single car manufacturer raise unsprung weights”

Dante Quote “Why does every single car manufacturer raise unsprung weights”

This statement is about as wrong and incorrect as anyone anywhere could read. You have singularly without my or anybody else’s criticism undermined your credibility. Who on this earth raises unsprung weight?!

Why do think: Aluminum wheels replace pressed steel at some 25 times the cost?, why does F1 and most other formula use carbon composite + titanium in their hubs magnesium wheels and carbon struts even though they later will have to add ballast to reach minimum race weight?, why build race tyres with the thinnest lightest construction possible?

Unsprung weight is the enemy of vehicle suspension; I could talk gyro effect, mass rotation kinetics and a host of other related topics but you would I am sure disagree. When in the future we are all using extreme lightweight composite material I suppose you will be requesting from your suspension specialist some “cast iron hubs please and are there a chance of a set cast iron wheels!

It saddens me to see people with no knowledge giving out misinformation about a product which is perfectly sound. I hope e90im took no notice!

I do hope you have the courage to contact the wheel manufacturer and tell them there product is dangerous? No I thought not.

As far as centering and wheel studs bear in mind 95%+ of all vehicles still use pressed steel wheels where the centre hole is no more than a punched out clearance whole.

If you still want to maintain your position here are some links go argue with the rest of the world.

http://www.roversd1.nl/sd1web/suspension.html

http://en.wikipedia.org/wiki/Handling#Unsprung_weight

http://www.cars.com/carsapp/national...eight_pop.tmpl

http://www.fordvehicles.com/help/glo...x.asp?letter=u


http://www.mecheng.adelaide.edu.au/c...lim_lim_co.pdf
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      12-16-2005, 04:00 PM   #16
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Quote:
Originally Posted by HUNTER
Dante Quote “Why does every single car manufacturer raise unsprung weights”

This statement is about as wrong and incorrect as anyone anywhere could read. You have singularly without my or anybody else’s criticism undermined your credibility. Who on this earth raises unsprung weight?!

Why do think: Aluminum wheels replace pressed steel at some 25 times the cost?, why does F1 and most other formula use carbon composite + titanium in their hubs magnesium wheels and carbon struts even though they later will have to add ballast to reach minimum race weight?, why build race tyres with the thinnest lightest construction possible?

Unsprung weight is the enemy of vehicle suspension; I could talk gyro effect, mass rotation kinetics and a host of other related topics but you would I am sure disagree. When in the future we are all using extreme lightweight composite material I suppose you will be requesting from your suspension specialist some “cast iron hubs please and are there a chance of a set cast iron wheels!

It saddens me to see people with no knowledge giving out misinformation about a product which is perfectly sound. I hope e90im took no notice!

I do hope you have the courage to contact the wheel manufacturer and tell them there product is dangerous? No I thought not.

As far as centering and wheel studs bear in mind 95%+ of all vehicles still use pressed steel wheels where the centre hole is no more than a punched out clearance whole.

If you still want to maintain your position here are some links go argue with the rest of the world.

http://www.roversd1.nl/sd1web/suspension.html

http://en.wikipedia.org/wiki/Handling#Unsprung_weight

http://www.cars.com/carsapp/national...eight_pop.tmpl

http://www.fordvehicles.com/help/glo...x.asp?letter=u


http://www.mecheng.adelaide.edu.au/c...lim_lim_co.pdf
Whoaa, man calm down! There seems to be a misunderstanding.
I wasn´t doubting your explanation, I was just asking you some questions, which you still didn´t or couldn´t answer.

When i said why would every single car manufacturer raise unsprung weights by building hubs with centrings, I was referring to your prior statement
Quote:
Originally Posted by HUNTER
Further to that when preparing a car for racing this one place (the hub) where metal is removed to lower the unsprung weight!
which means in reverse that in your opinion there has to be needless material (the referred centrings) which causes higher unsprung weight.

It wasn´t my intention to offend you (note the )

But you should start reading more carefully, before starting to offend anyone yourself!

Cheers!

Last edited by Dante; 12-16-2005 at 04:14 PM. Reason: bad typo
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