AMG/OZ 3-piece "classic" wheels on SLK 32 AMG - Mercedes Benz SLK Forum

General Discussion Topics must pertain to all 3 generations of SLK - R170, R171 and R172

 
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#1 Old 07-31-2009
SLK_32_AMG
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AMG/OZ 3-piece "classic" wheels on SLK 32 AMG

These wheels could originally be fitted on one of the following models: R129, C126, W126, W201, W124 (I think, maybe fitted on other models too). If you have installed these wheels please let us know because, as in other cases, info is scarce and this could be useful for future reference.

Details of the wheels can be found here (absolutely amazing):

http://www.alloywheelsdirect.net/mer..._3pc_wheel_509

And pics with these wheels on the R170 32 AMG are here (this guy is a genius!):

http://c280.pmneo.de/index.php?content=gallery&gid=358


You must have a look at this before you change anything:

http://www.carbibles.com/tyre_bible_pg2.html


The problem: different width and diffrent ETs (but keeping same diametre: 17" and the same tyres: 225/45-17, 245/40-17).

Front wheels: going from current 7.5" (191mm) to 8.5" (216mm) gives you an additional 13mm (0.5 inch) on each side - this would be if the offset (ET) were the same. But going from current offset ET37 to ET18 actually 'pushes' the wheel towards the outside of the car. The combined effect is that you get 6mm extra space between the wheel and the suspension area but the wheel will stick out 32mm further from the current position.

Rear wheels: going from current 8.5" (216mm) to 10" (254mm) gives you an additional 19mm (0.75 inch) on each side - this would be if the offset (ET) were the same. But going from current offset ET34 to ET17 actually 'pushes' the wheel towards the outside of the car. This time the combined effect is that you get 2mm less space between the wheel and the suspension area (negligible) but the wheel will stick out 36mm further from the current position.

I think the sticking-out of the wheels is rather cool (Mad Max ) but it is an issue because as long as the wheels go beyond the bodywork, I will fail the Spanish ITV (TüV equivalent). 3.2cm and 3.6cm seems very little but it will surely be noticed by the inspection, especially at the front wheels as the originals are right on the edge of the bodywork already (owners of 32 AMG, have a look). No problems with the space between the wheel and the suspension though.

I don't know much about these matters, but if the ET of the new wheels could be changed, in this case increased, it could fit nicely. 'Sweetspot' would be somewhere around ET34 for the new front wheels and ET25 for the rear wheels - wheels would be sticking out less and I have allowed for a maximum of 1cm narrower space between wheel and suspension area vs. original to be safe. You could go for a higher ET, reducing the sticking-out but the wheel would get too close to the suspension area maybe. Sorry if it is a dumb question but is it at all possible to change ETs?

Is there anything else that can be done so that the wheels don't stick out so much or generally to position the wheels correctly. Any feedback is welcome. Sorry about the novel here but it may be useful for future reference.

Cheers

Darío
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#2 Old 08-07-2009
SLK_32_AMG
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Update

In the previous post I was talking about the following wheels:

Front: 8.5x17 ET18 - Part number: B66020063
Rear: 10x17 ET17 - Part number: B66020064

These fit but you'd be on the very edge of safety really, especially at the front wheels.

The above wheels were made for the 129. Since then, I found out, with the invaluable help of Chris Murray at http://www.alloywheelsdirect.net/, that the same wheels were made for the 124, exactly the same but narrower and with higher ETs (hurray!).

Front: 8x17 ET30 - Part number: B66020061
Rear: 8.5x17 ET30 - Part number: B66020062

In this case, the variance is within reasonable limits:

Front wheels: going from current 7.5" (191mm) to 8 (203mm) gives you an additional 7mm (0.25 inch) on each side - this would be if the offset (ET) were the same. But going from current offset ET37 to ET30 actually 'pushes' the wheel towards the outside of the car. The combined effect is that you get 1mm extra space between the wheel and the suspension area but the wheel will stick out 13mm further from the current position.

Rear wheels: keeping the current 8.5" (216mm), but going from current offset ET34 to ET30 actually 'pushes' the wheel towards the outside of the car. This time the effect is that you get 4mm more space between the wheel and the suspension area (negligible) but the wheel will stick out 4mm from the current position.

The only problem now is the price - you need 4000 Euros to change into these wheels - but that's another story.

Again, if anyone has got these wheels, please do give us a shout.

#3 Old 08-18-2009
SLK_32_AMG
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Further update

This is a further update for any R170 looking to upgrade to these awesome and classic wheels.

The local Mercedes dealership has confirmed that the rear 8.5x17 ET30 - Part number: B66020062 - is no longer available. I have asked Chris at alloywheelsdirect to see if he can somehow find these. The front 8x17 ET30 - Part number: B66020061 - is available but in limited numbers.

In the meantime, I've had a look at ebay and there are a number of refurbished original sets from apparently respectable sellers (100% feedback). These are mostly the 129 version, which are way too wide. There are only a few 124 version wheels but mostly sets of 4 equal wheels which makes sense since the 124 has a 4x1 instead of the 2x2 staggered setup.

The fact that they were made as sets of 4 equal wheels is not a small matter because the two wheels vary in shape and the result is not great (read on). Bearing in mind that these are 3-piece wheels, the 8" wide wheel is actually made up of a 6.5" inner rim plus a 1.5" outer rim (or lip), whereas the 8.5" wheel is made up of a 7.5" inner rim plus a 1" outer rim. This means that the narrower 8" has a deeper lip than wider 8.5", so the front wheels would be more 'deep dish' than the rear - which is bizarre - but these were made to fit as sets of 4, so this dilemma would have not come up.

There is a solution, I think, but someone would need to kindly check if I am completely off the tracks.

Switching the outer rims (lips)! If you switch the lips around, your would get a 6.5" inner rim plus a 1" outer rim, resulting in a 7.5"x17 ET36. The ET actually increases because of the reduced wheel width. This is as close as you can get to the stock setup (7.5x17 ET37).
The rear wheels would now be a 7.5" inner rim plus the wider 1.5" lip, resulting in a 9"x17 ET24. In this case, the ET is reduced because of the increased wheel width. This would not be as close to stock (8.5x17 ET34) as the front, but you would get the rear wheels sticking out 16mm from current position (approx 0.5"), which is within reasonable variance. Actually, just looking at the car you can see that space is tighter at the front, so it is advisable to keep as close to stock as possible especially at the front wheels. In any case, this is well within the fitting guidelines:

http://www.alloywheelsdirect.net/inf.../mercedes-benz

So you would get as close as possible to stock (especially at the front where it's tighter) and you would get the correct deep dish look (deeper at the rear wheels). Mind you, I think 1" is the smallest lip size offered by OZ, so at 1" front and 1.5" rear it is a really subtle deep dish look.

In any event, and if this is not possible, you could also ignore the stock 2x2 staggered look and go for a set of 4 equal wheels and save yourself a headache ().
Looking at the fitting chart above, the 8" would fit perfectly in front but it would look rather thin on the rear, plus you would be better replacing the rear tyre from the stock 245 as it may be a little wide for the 8" wheel.
The 8.5" on the other hand sits perfectly on the rear wheels and the fitting chart suggests you could go as far as 8.5x18 ET25 in front, so you should be OK with 8.5 ET30 in theory. Plus, you get the thinner 1" OZ lip, which I think is nicer (especially having all 4 wheels the same).

I hope I can conclude this upgrade properly and let you know what the outcome is. I don't think there's one single SLK in Spain with these wheels on (nevermind 32AMGs).

Any ideas? Give us a shout!
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#4 Old 08-26-2009
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Unhappy Hard luck

Update for those wanting to fit these wheels on the SLK. It's become really difficult but I have finally been able to pin down a couple of options that could work:

Option 1
Front: 8"x17" ET24 (7" inner + 1" outer rims) - smallest lip size available
Rear: 9"x17" ET24 (7.5" inner + 1.5" outer rims) - slightly deeper rear

Option 2
Front: 8.5"x17" ET30 (7.5" inner + 1" outer rims)
Rear: 9"x17" ET24 (7.5" inner + 1.5" outer rims) - slightly deeper rear

This requires a slight custom work that could be done by mixing 2 X 8.5x17 ET18 (from the 129 series front) and 2 X 8.5x17 ET30 (from the 124 series) for Option 1, or with a set of 4 X 8.5x17 ET30 with a 1.5" extra lip for Option 2.

That's "all" you need. The problem is that the price is simply too high for nearly 20-year-old refurbished wheels. The technology and the materials have certainly improved during the past two decades. At the price of the refurb ones you may consider buying them new, if you can still find them. Anyway, I don't think it makes too much sense IF you want to go by the book and the only justification is if you have a very 'special feeling' for these wheels - I confess mine is no longer 'special'. I take the opportunity to thank wheel-wizard on ebay UK who has been really helpful in clarifying everything - very helpful and an enthusiast too! Highly recommended.

Next, considering brand new wheels (see pic)

Cheers

watch out ebay though, sellers know these wheels are back in style and they're not all as cool as wheel-wizard - it does attract amateurs looking for a cheap buck - I bumped into a really rude guy in ebay Germany who told me that I ask too many questions and he wanted an easier deal (at 1.800 Euros for refurb 20-year old wheels). If you're trying to fit rare wheels on a rare car from two different countries and in a third language, you gotta ask questions, what else. - In Spain we would say: "he has a very hard face"
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#5 Old 08-26-2009
 
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Don't know about the fit, but I really do like the look of those wheels.
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#6 Old 08-27-2009
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