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  #1  
Old 06-19-2007, 12:40 AM
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Location: Greenville, NC
Posts: 533
W126 lug size problem 21ET to 25ET

Found some nice OE (1986-1991) 7JX15H2 25 ET (offset) rims to replace my ugly 6.5JX15H2 21.5 ET on my W126 1984 300SD. Used the long extended lugs that that worked for the 21.5 ETs but the lugs will not go in all the way (need 1/4 inch more), the tire wobbles so had to use the old lugs that came with the 14" bundt cakes. This works but does not look right because they do not meet with the face of the rim and are down deep in the holes.

The FSM does not say anything on a different lug size between the two smooth face 7X15 and 6.5X15 wheels..

Also did alot of searching this forum for answers.

Some things I have been thinking; put some more thread on the lug thread so it can go in more. cut the lug thread to fit the 14" bundt cake thread size. call the mb dealer and get frustrated.

May try to post some pics of the lugs.

Thanks

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #2  
Old 06-19-2007, 01:49 PM
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Location: Northern Virginia
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I thought they used the same lug bolts.

I have the same situation, with the 21.5 wheels on the car now, and the 25 wheels waiting for the right time and place (a good sale) to get tires on them and then put on the car.

The 25 wheels came with a set of lug bolts. I will work on finding them and laying one besides one from the 21.5 wheels on the car.

I just did some comparisons on the parts pages here and found the same lug bolt is specified for such cars as the 1986-7 300SDL, the 1991 350SD(L), and the 1988 560SL.

If I remember correctly, my 25 wheels came off an SL class. I've not bolted them up yet, and I may be facing the same problem as you. Glad to have read your post before getting new tires mounted.

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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  #3  
Old 06-19-2007, 02:29 PM
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Location: Greenville, NC
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Yeah Ken you may run into problems. I took one wheel off and stuck all three different lug bolts through the hole. On the long 3.75" wheel bolt 126 400 00 70, the threads need to run another 1/4" or so, then the head will still not be flush with the wheel face (the 7X15 25 ETs must be thicker-has deeper bolt holes than the 21.5 ET). Same with the W124 lug bolt. The lug that came with the 14" bundts works but does not look right, is in the hole way too deep.

The FSM states that the W126 7JX15H2 25ET (126 400 30 02) was phased out in 1988 for the 21.5ET 61/2JX15H2 (126 400 41 02). It talks about a 3) "use wheels part no. 126 400 30 02 (flush wheel disc) for conversion"? The FSM also mentions wheel lock bolts B6 640 8101 and wrench head B6 640 8105.

The long bolt 3.75" 126 400 00 70 has a head length of 43.5 mm, it needs to be longer, although the thread shank length can be shorter.

Another option is to find some kind of ball head insert washer to go between bolt shank and rim (to take up the slack).

And yet another option is to get a 12 X 1.5 die and add another 1/4" of thread, the bolt head will still be about a 1/2" or more in the bolt hole.

Another no longer in stock parts venture begins!!!! will try dealer, ebay, parts forum, junk yards.
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #4  
Old 06-19-2007, 03:43 PM
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Location: Greenville, NC
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More updates; the Febi bolt (124 400 07 70) pulls up for all 1986-1991 w126 and W107 chassis so the SLs are the same. This bolt looks even shorter than the 3.75" 126 400 00 70 bolt.

There is an LA ebay seller that has some chrome 95mm that may work, I wonder if they could do a custom size order?
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification
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  #5  
Old 06-19-2007, 04:50 PM
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Do you know what vehicle type your ET25 wheels came from? A W126?

I believe my ET215 wheels came from a 1988 300SE.

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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  #6  
Old 06-19-2007, 10:37 PM
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No, I do not know Ken, but seller (tire shop some kid got some "spinners" and did not want ) seller said he thought it was a sedan not an SL.

FSM for 7 X 15 25 ETs; 126.125, 126.039 and other W126s. 190Es have 6 x 15, 300Es have 6.5 x 15 with higher offsets like 38-48 ETs.
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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  #7  
Old 06-22-2007, 10:04 PM
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personally, I'd stick w/ the bundt lugs, I know they look a little weird @ 1st, but on the bright side, you'll never twist the head off of one of those extended lugs...Nightmare!!!
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  #8  
Old 07-23-2007, 04:08 PM
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Update, I went to Sears and bought a 12 X 1.5 hex die. Used a 27MM deep socket, 1/2 drive ratchet, vise and plenty of cutting fluid. I added about 1/2" of thread on the all 20 lug bolts. This now brings the bolts out (thumbnail from wheel face) and looks alot better.

For the rear wheels I have to cut about 1/4" off the end of the bolts with a hack saw because they were too long and hitting the parking brake shoes inside the hub (spin wheels by hand before you drive).
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification
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  #9  
Old 07-23-2007, 09:03 PM
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Join Date: Nov 2006
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Considering that this should all work without problems when you use just regular interchangeable MB wheels (W123/ W126/ W107 pretty much work without issues) this does not seem to have been worth it.

Sorry, but that's just my opinion. Do you have a picture of the wheels on the car?

Quote:
Originally Posted by James L View Post
Update, I went to Sears and bought a 12 X 1.5 hex die. Used a 27MM deep socket, 1/2 drive ratchet, vise and plenty of cutting fluid. I added about 1/2" of thread on the all 20 lug bolts. This now brings the bolts out (thumbnail from wheel face) and looks alot better.

For the rear wheels I have to cut about 1/4" off the end of the bolts with a hack saw because they were too long and hitting the parking brake shoes inside the hub (spin wheels by hand before you drive).
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  #10  
Old 07-24-2007, 09:40 AM
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Location: Greenville, NC
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123, the wheels are interchangable as you stated but one will have to make a choice on lug bolts. The offset of 21.5 to 25 makes the OE 1986+ bolts not work without modification. The short Bundt lugs will work but they are deep in the holes. I wanted to use the bolts I had so it was alot of work to modify, but they do look alot better. I can see the bolt heads in the holes, before I could not and it looked weird.

There are some ebay sellers with chrome bolts that have thread going all the way to the ball head, this would work and eliminate the die thread cutting but the rears wheel bolts may need to cut off some so as not to hit the parking brake shoes inside the hub.

I would post pics if anyone can tell me how to reduce image to post. Can I do it with windows XP pro? I do not want to download any image software.
__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification
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  #11  
Old 08-22-2007, 05:53 PM
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Join Date: Aug 2001
Location: Northern Virginia
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I move rather slowly on my projects - last weekend I had a 6.5xET215 wheel off the back of the 1984 SD and bolted up the 7xET25 wheel. It fit properly with the same lug bolts which I purchased from MercedesShop back when they were available. I remember them being Febi brand but can not be absolutely sure.

The inside rim appears to sit closer to the shock absorber/spring/inner fender area. That makes sense to me, as you've added about 12.7 mm of rim width and only changed the offset by 3.5 mm. Now that I think about it, these two measurements might be additive, so the inner rim is 16.2 mm closer to the car body. A higher offset moves the rim inward towards the car, right?

Since I don't have any tires on the ET25 rims, I can't tell if they would rub on the 84 SD or not. Looks like just enough clearance to run OK. And I haven't done any checks on the front.

Some time in the future I may go with the ET25 rims and 205 tires on the SD and move the ET215 rims back over to the W123, where they did fine.

There must be multiple versions of lug bolts among the models and years we are talking about that run these rims.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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