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Old 04-24-2021, 11:06 AM   #1
Join Date: Dec 2020
Default Dumb, lazy, newbie question

I'm embarrassed to ask... but not so much so that I'm not posting to a very public forum: I just got my 240 back after having a set of tires mounted to Virgo wheels. I had to do a state inspection so, rather than do as I usually do, I had the mechanic mount the rims on the car (I usually do it myself so that I know the torque settings are correct).

At any rate, the passenger rear wheel has 5 lugs; but the driver's side only 4. Closer inspection shows some sort of alignment/locating pin that is taking the space up where a lug should go.

Can anyone weigh in on why this is unique to the driver's side only? Thanks!
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Old 04-24-2021, 11:48 AM   #2
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Fa182's Avatar
Join Date: Apr 2016
Location: Austria

All 4 corners of the car should have 5 studs + 1 disc / wheel pin.

The pin is not necessary per se, it should just hold the brake disc on when removing the caliper.
Meaning if the pin is not there under normal circumstances, it's not an issue.
I forgot if you need to remove the pin with Virgos, it has been too long since I mounted a set.

This is how all 4 should look like (minus the different calipers for the front).
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Old 04-24-2021, 05:02 PM   #3
Join Date: Dec 2020

Very helpful, @Fa182. Thank you. Must be a broken stud. Will have to set down my laptop and wander to the garage to take a closer look.
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Old 04-24-2021, 06:52 PM   #4
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Join Date: Apr 2009

More than likely a broken stud. The Virgo rim will not fit with the small pin in place.
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Old 04-25-2021, 02:15 AM   #5
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MasterBlaster's Avatar
Join Date: Feb 2009
Location: Port Coquitlam

Besides holding the rotor on, in the past some shops could balance the wheels on the car, so the wheel and rotor would be spun as a matched pair. The pin is to keep the wheel in the same orientation relative to the rotor.

Page 96 of your 1991 240 Owner's Manual...
Note: To avoid excessive tire wear and rebalancing, mark and reinstall wheels in same location and position as before removal. To lessen the chance of imbalance, each wheel hub is equipped with a guide stud to ensure that a removed wheel can be reinstalled in its original position.

1990 740GL, now in extra-small economy size.
513,000 km so far...
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