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I did a search but too many came up. Simple question ;-)
 

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It's not a simple yes or no.. :)
the offset is not exactly the same on 123 and 201.
And brake calipers on 123 use more room in the wheel..
I have used 6.5 inch by 15 inch aluminium w201 wheels on one of my 123's
15 inch steel wheels is probably ok.
So the answer is: try a front wheel on your car.. does it fit? and does it look good?
 

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Concerning my 126. I have purchased wheel spacers to fit the 15" flat bundts, the calipers clear, but on the front the hub centric machined area is not correct.
They don't fit on, rears, OK.
 

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Yes, it is not a simple answer. Here is a chart that you can decipher: (wheel size/offset/tire size/mfg)

W123 series saloons
14x5.5 30 175R14 Mercedes-Benz
14x6.0 30 195/70R14 Mercedes-Benz
15x5.5 35 185R15 Mercedes-Benz
15x5.5 35 195/70R15 Mercedes-Benz M+S tyres


190 Series (W201)
14x5.0 50 175/70R14 Mercedes-Benz
15x6.0 49 185/65R15 Mercedes-Benz
15x7.0 41 205/55R15 Mercedes-Benz
15x7.0 44 205/55R15 Mercedes-Benz
15x7.0 35 205/55R15 AMG
16x7.5 31 225/45R16 AMG
16x7.5 37 225/45R16 AMG
16x7.5 42 225/45R16 AMG
16x8.0 34 225/50R16 Mercedes-Benz
16x8.0 35 225/50R16 Mercedes-Benz

So the answer is: try a front wheel on your car.. does it fit? and does it look good?
 

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From m-b-z-.org

There are two basic offsets. The early cars had a small offset:
Pontons, Fintail, 108/109, 114/115, 116, 126, 123 and 107
More recent cars had the larger offset:
201, 124, 202, 140, 129, 210, etc, etc.
As offset change with rim width there are heaps of differant offsets.
The Late Ones The Early Ones

5.5 X 14 ET35 6.0 X 14 ET30
5.0 X 14 ET50 6.5 X 14 ET30
6.0 X 15 ET49 6.5 X 15 ET30
6.5 X 15 ET49 7.0 X 15 ET25
7.0 X 15 ET44 8.0 X 16 ET23


ET44 is the dimension in mm front centre of the rim to the face where the hub bolts to the rim.
So ET25 is quite small (25mm from the centre of a 7" rim). The later cars were something like ET44, that is a lot further from the centre. So if you put a W124 rim on a W126 the inside of the rim is in danger of fowling on the steering arm and maybe even the brake lines - this is known in the trade as "a real bad thing".

The stud pattern has remained the same over the years, just the offset changed. Regarding spacers: check with the local regulatory agencies first. They're illegal here in Australia.

John Greene

Some actual offsets of various Mercedes chassis

W126
6.5" - 21.5mm
7" 25mm
201 and 124 Mercedes offsets
The '84 201s came standard with a 14" 15 hole alloy 5" wheel (looked like the 15" wheels used on 124/126 from '86 on but was 14"). It had a unique lug bolt (not used on ANYTHING else that I know of). Part way into '85 they switched to a 6x15" wheel (changing to the same lug bolt used on the 124s). Except for not fitting on the 190E-16V sports cars, in '84-'86 you could swap these 14 and 15" wheels around. The introduction of the 190E 2.6 and 190D 2.5 turbo, both with vented front rotors and a larger caliper assembly (in MY '87 I think) the 15" wheels were redesigned and while none of the standard measurements changed listed in the specs changed, the newer wheels cleared the larger brake assemblies fitted to the more powerful of these newer cars where the older ones didn't clear! All of these wheels had 48-50 mm offset. The later wheels could be used on all of the earlier cars. All the US sold 124s thru the '80s used 6.5x15" wheels with ~49 mm offset (though the sportlines in the mid '90s MIGHT have used a 7 or 7.5" wide wheel - I have NO wheel listings for '90s 124s). None of these wheels should be fitted on any 123/126 even if they MIGHT physically fit! The '86+ 126s used either 6.5 or 7 x 15 wheels with 21.5 or 25 mm offset respectively. THEY can be fitted to older 126 and 123 cars but NOT to 124/201s

Marshall Booth
 

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Yes, Marshall, why not even if they fit?
Marshall Booth was a true MB guru, owning numerous models over 40 years. He passed away last year.

If you read the unbolded part, you can see where the original poster states that using W124 rims on a W126 could cause damage to the steering arm and brake lines even if they physically fit. You say say (W124s and W126s) aren't the issue here, but the W124 has the same offset as the W201, and the W126 has the same offset as the W123.
 

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Marshall Booth was a true MB guru, owning numerous models over 40 years. He passed away last year. Oh, I was unaware.

If you read the unbolded part, you can see where the original poster states that using W124 rims on a W126 could cause damage to the steering arm and brake lines even if they physically fit. You say say (W124s and W126s) aren't the issue here, but the W124 has the same offset as the W201, and the W126 has the same offset as the W123.

I pulled the rims from the JY, thought it was a 124.
Any way to determine for sure?
 
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