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Long time Lou :)
I think what is confusing for most is ET.
The factory 7 " rims have ET of 41 from what I remember.
ET 37 should work as those cars have huge fenders, but the wheel will go "under the car" more, so it is cosmetic issue. Not a big deal with 4 mm, but some.
For my 9" rims I have ET 33
 

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Yes, Sir K. Long time but I still have the same two W210's. Wanted to get a newer wagon but all these air suspension stuffs scared me off.
 

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And rightfully so Prof.
Our W211 wagon works well in California weather, but gave me wet back when air suspension froze in Nebraska and stupid software dumped the air that hold overnight.
Computerized air system, with no backup is definitely not admirable in freezing weather.
That is why I still have 2 W210 for family as well, although I am trying to sell one.
But W211 is for sale as well :D
Whatever sells first
 

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The problem is that these cars are not worth anything on the market. :) When I got my 2015 Outback, the dealer wanted to give me less than 10% of the purchase cost (when it was new) of my 2003 E320 4Matic wagon with only 100k miles. For that kind of $, I decided to keep it.
 

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'72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
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Long time Lou :)
I think what is confusing for most is ET.
The factory 7 " rims have ET of 41 from what I remember.
ET 37 should work as those cars have huge fenders, but the wheel will go "under the car" more, so it is cosmetic issue. Not a big deal with 4 mm, but some.
For my 9" rims I have ET 33
I just installed the W203 C230 wheels. The fronts are 17x7.5 ET37 and the rear 17x8.5 ET34. All 4 winter tyres are 225/45R17. Seemed to fit just fine! (8.5s on back). They also give the car a more modern look!
 

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93 190E 2.3, 94 E320 (sold), 01 E320, 99 S320, 18 Durango
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I just installed the W203 C230 wheels. The fronts are 17x7.5 ET37 and the rear 17x8.5 ET34. All 4 winter tyres are 225/45R17. Seemed to fit just fine! (8.5s on back). They also give the car a more modern look!
Can you post some pictures?
 

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Yeah,. pictures are good.
I am thinking about going back to factory 16" wheels.
The reason is that I just bent 18" AMG wheel.
With road conditions going down the drain, low profile tires become just too dangerous.
Don't take it wrong, I bent 16" factory wheel too on Los Angeles freeway hole, but that was in panic braking on the shoulder, while last bent happen while accelerating on merging lane.
You just never know when a hole will appear in front of you and seem nobody cares anymore.
 

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One thing that is not so good about the W203 style of rim, is that the spoke and hub protrude out from the plane of the tires. As a result, the spokes can hit into things! The used rims I bought have a few dings where that has happened.
 

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Can you post some pictures?
One thing I noticed, was that the stud heads stick out on the fronts, but on rear they are recessed. I only checked that thread protruding from rims was over 1/2" on one rim. I should have done it on both 7.5 and 8.5s. I may have to take one rear off and check again unless I can find specs for W203 studs somewhere.

Here we go with pics:
 

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Look good, even I am fan of monoblocks.
I would not worry about sticking out bolts too much. Just clean them, so they don't show rust, or repaint them.
One of the issue of putting narrow tires on wide rims is that the rim is exposed to curbs. Some tires have bigger sidewall lip than other.
I have 235 tires on 9" wide rims, but Triangle tires still stick out farther than the rim.
 

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Look good, even I am fan of monoblocks.
I would not worry about sticking out bolts too much. Just clean them, so they don't show rust, or repaint them.
One of the issue of putting narrow tires on wide rims is that the rim is exposed to curbs. Some tires have bigger sidewall lip than other.
I have 235 tires on 9" wide rims, but Triangle tires still stick out farther than the rim.
I compare the stud specs on epc for W203 and W210.

W203 - part 0009904807 12x1.5 40mm
W210 - part 20340102790 12x1.5 40mm

Checking on eBay and other sites, it looks like the W203 lugs don't have the extension that the W210 has and therefore probably don't protrude on front. No different part for front & back, so presumably thread length into hub is same.

I might try and find a set of W203 lugs - that would allow me to put these rims on our W123 if we decide sometime that it will be our winter car.
 

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No need to quote under quote ;)
I have the long heads bolts on son car with wheels from E420 and it does not bother me. I have extra set of bolts with long heads and don't want to spend money on additional set. Since our bolts don't have corrosion on them, the small mismatch is barely noticeable.
Now W123 rims might have thinner wall, therefore will need shorter working part of the bolts.
Double check it as inserting long bolts can damage parking brake and some other parts.
In case that might interest you, I just run into W123 wheels in perfect condition.
Mercedes classic bundt wheels with New tires
 

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Discussion Starter #35
I compare the stud specs on epc for W203 and W210.

W203 - part 0009904807 12x1.5 40mm
W210 - part 20340102790 12x1.5 40mm

Checking on eBay and other sites, it looks like the W203 lugs don't have the extension that the W210 has and therefore probably don't protrude on front. No different part for front & back, so presumably thread length into hub is same.

I might try and find a set of W203 lugs - that would allow me to put these rims on our W123 if we decide sometime that it will be our winter car.
Graham, two things.

One, the part number isn't really a concern since the extended-shank lugs are NLA. MB pulled them back and replaced/superseded them with the "normal" lug bolts, which is slightly different than one you listed: 2034010270. (Note that the one you listed for the 210 is a 203 part number as well.) That said, you should indeed replace them with normal lugs. Those extended shank things in the 12M size shear far too often for any comfort level, and the cost of replacing a wheel is less than a set of proper lugs...not even including the frustration cost or towing costs that might result from a flat in the middle of nowhere and a wheel that can't be removed.

Second, your tires may "fit", but they are too small. They are 203 chassis sizes, so your speedo is off, your ODO is logging more miles than you actually travel and you lose some ground clearance. You'd want the staggered sizes for the 210 chassis, which would be 235/45-17 up front and 265/40-17 in the rear. Those will likely suck horribly in the winter unless you buy good quality ice and snow tires, though. ;)

Good luck.
 

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Graham, two things.


..your tires may "fit", but they are too small. They are 203 chassis sizes, so your speedo is off, your ODO is logging more miles than you actually travel and you lose some ground clearance. You'd want the staggered sizes for the 210 chassis, which would be 235/45-17 up front and 265/40-17 in the rear. Those will likely suck horribly in the winter unless you buy good quality ice and snow tires, though. ;)
Believe me CC, I did a lot of checking before I bought those rims and tires! I considered myself lucky to find them, because there were no Mercedes rims for sale within 150 miles of us until these ones came up, let alone ones that would fit car. I feel the ones I got are almost right - certainly close enough.

The tires are 0.3" smaller in diameter than the stock 215/55R16s on factory rims. That will cause speedo to read 60mph when actual speed is 59.3mph (1.2%) Nothing to get excited about and perhaps a good thing :) Tires worn just 5/32" can produce similar discrepancy.

Using 265/40R17s will cause speedo to be 0.3% out which is smaller discrepancy, but according the tire size site, there are potential clearance problems.

The link I posted in the other thread says that a W210 with stock 17" 7.5 or 8.5 rims should use 235/45R17 tires. (These will also cause speedo to be 0.3% off and they are stock size!) It also says rears would need ET of 30.

BTW, that 2034010270 lug number still comes up as a valid number on epc for W210, but not for a 203. Some vendors say number for W210 has been superseded by 0009904807. Both are 12x1.5x40mm. Without the extension, heads of the new bolts would presumably be well buried in stock W210 wheel cavities.

One of my criteria, was to buy rims that would also fit my W123 and R107. I think these C230 rims will. In fact one guy in 107 forum already has similar rims on his 107.
 

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Discussion Starter #37
If you want to use them on the 123, then those sizes are fine.

Your spec on the 17" tire size is based on a NON-staggered setup. While you can run the same size tire all the way around, some tire stores will not mount them on staggered wheels; conventional wisdom is that may result in undesired handling, particularly in an emergency situation. I'm not sure how that plays out in the real world, though.

Using a tire size calculator is based on raw numerical data. (You'd find that the 235/45-17and 265/40-17 are the same OD...comparing them to the 16s is irrelevant.) However, there are variances within manufacturers and even among different tire models from the same company, so it is generally best to look at specs for the specific tire you're considering. That said, however, since you want to freely swap those wheels among your "fleet" then you're better off sticking with those tire sizes. Thus, I'd stay with those sizes, observing the staggered difference, when the time comes to replace them.

Re: the lug bolts...my point was that whatever the part number, the extended shank lugs are no longer available, which IMHO is a good thing. ;)

Good luck.
 

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(You'd find that the 235/45-17and 265/40-17 are the same OD...comparing them to the 16s is irrelevant.)
The stock car has 16" wheels with 7.5" rims and 215/55R16 tires. The speedo & odo are presumably calibrated to read correctly with these tires.

If we want to put something else on, then surely we should compare our choice with the 16" standard wheels? That tells is if the diameter is OK.

While you can run the same size tire all the way around, some tire stores will not mount them on staggered wheels; conventional wisdom is that may result in undesired handling, particularly in an emergency situation. I'm not sure how that plays out in the real world, though.
I am surprised you say some will not mount them? In the link from alloywheelsdirect, it is interesting to note that for staggered rims, they (AMG actually) use same 235 width tires all round for W210. Max width used is 255 and then they have them on same size rims all round. On the C230, they did use wider tires at rear.

Code:
  	16x7.5 	41 	215/55R16 		        		Mercedes-Benz 	
  	17x7.5 	37 	235/45R17 		        		Mercedes-Benz 	
  	17x7.5 	37 	235/45R17 		        		AMG 	
  	17x7.5 	37 	235/45R17 	17x8.5 	30 	235/45R17 	AMG 	
  	17x7.5 	35 	235/45R17 	17x8.5 	30 	235/45R17 	AMG 	
  	17x8 	37 	235/45R17 		        		Mercedes-Benz 	
  	17x8 		235/45R17 		        		Brabus 	
  	17x8 		235/45R17 	17x8 		255/40R17 	Brabus 	
  	17x8.5 	32 	235/45R17 		        		Carlsson
If these were summer tires, I think that 235/45R17 all round would be correct for our W210 if we were using the new rims. But for summer, it will stay with 16" 215/55R16s.
 

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One thing I noticed, was that the stud heads stick out on the fronts, but on rear they are recessed. I only checked that thread protruding from rims was over 1/2" on one rim. I should have done it on both 7.5 and 8.5s. I may have to take one rear off and check again unless I can find specs for W203 studs somewhere.

Here we go with pics:
Looks nice. Just get the lower cladding painted to match the car and it will even look better and more updated.
 

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Discussion Starter #40
I am surprised you say some will not mount them? In the link from alloywheelsdirect, it is interesting to note that for staggered rims, they (AMG actually) use same 235 width tires all round for W210. Max width used is 255 and then they have them on same size rims all round. On the C230, they did use wider tires at rear.
{sigh}

My point, which is at this point smothered underneath the vermin that were crushed by the horse as it fell dead before being further beaten, was that MB didn't put staggered 17" wheels on the 210. The only staggered setup was on the AMG with 18" wheels. Extrapolating from a chart about what tire sizes MB used on the chassis with the same size wheel at each corner isn't an accurate way to reach your conclusion.

Conventional wisdom: If you run staggered wheels, you should run staggered tires. Note that you will not find any staggered setup coming from MB or other manufacturers that has the same size tire front and rear.

Many tire shops, at least in the US, typically will not install the same size tire on staggered wheels for the reason I noted earlier. No reason to beat that part of the horse again.

That said, if the shop simply looks at the car, sees 17s, checks their book and sees the nominal 17" size for the W210 chassis, they may not note the wheel discrepancy (again, since the 17" wheels weren't staggered on the W210). Thus they may happily sell you the 235/45 for each wheel. However, spin balancing is based on the wheel width, so it's possible that the tech may catch it at that point. Whether the shop follows a policy is a different question, and I have no idea what the rules are up north, either.

And that said, there are plenty of shops in the US that don't care, they are just happy to have your business. I've run into both kinds, and some can be real sticklers. For example, when I bought my new tires, one store would not sell me the size I wanted (225/50-17) because it wasn't listed as an option in their book for 17" on the W210 chassis. They were apologetic, but required to follow their policy, so I went elsewhere.

Finally, the AMG variant uses a 275 width tire in the rear, so clearance depends on offset. Using the 203 wheels may not give you the option to go to 265 anyway, since they use a different offset than the 210, and they might be too narrow for the 265 as well. (My point here again was that you don't compare the rear 17 to the stock 16, you compare it to the front 17 for the correct staggered setup, and the 275 was correct in that scenario.) In any event, it's immaterial, since you want to fit them on the 123 chassis. So you're best off staying with those stock 203 sizes. Period.

Still, as I always say, one good thing about owning a car is getting to decide what you do to it, be that maintenance, mods or otherwise. I'm not arguing with you about your decision (either way), I'm just trying to share the correct information so that others reading the thread don't misinterpret things and go off half-cocked with incomplete information.

Good luck; it will be cool to see pics of those on your other cars, too. I've seen them on the 123, but not the 107, so that's the one I'm most interested in seeing. :D
 
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