Why does Mercedes use bolts instead of nuts for the wheels? - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 04-14-2002, 11:46 AM Thread Starter
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Why does Mercedes use bolts instead of nuts for the wheels?

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post #2 of 9 (permalink) Old 04-17-2002, 12:41 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

it is easier to work on the brakes with bolts because the studs would be in the way. It makes it a lot faster to change out the rotor, and the rotor doesnt have to support the weight like cars with lug nuts.<br> <br> Does that answer it?<br> <br> Austin
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post #3 of 9 (permalink) Old 04-17-2002, 12:53 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

I maybe losing my memory, but here is what I remember from one of MB articles. MB and some automakers (i.e. SAAB) use the center ring/lip on the rotor to center the tire relative to the rotor; Bolts are there to keep the tires from flying out. On other brands, nuts must do two jobs: center the tires and keep the lock to the rotors. Apparently, MB feels that their design is much stronger. I could be wrong.
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post #4 of 9 (permalink) Old 04-17-2002, 03:23 PM Thread Starter
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Thank you guys

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post #5 of 9 (permalink) Old 04-17-2002, 05:40 PM Thread Starter
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BMW uses bolts too

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post #6 of 9 (permalink) Old 04-17-2002, 09:53 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

I don't think there is a mechanical advantage. Cosmetically, the bolt is cleaner and does not require a cap to cover up the ugly nut. I believe in germany where they sell a 'more affordable' rendition of the cars they sell here in the US, they typically are delivered with hub caps and though I have not looked under one, would guess that they use studs and nuts. Further, it has not always been that way here. Alloy wheels only started appearing in the 80's on the lower priced cars and all the capped cars used studs and nuts. If you have changed a wheel lately, the bolts are a pain in the butt compared to the ability to center the wheel on studs.
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post #7 of 9 (permalink) Old 04-19-2002, 12:37 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

all ll merceds use wheel insted of studs, packed in you orig tool kit there should be a wheel mounting tool (looks like a long headless bolt) holes that supports the wheel while you put the other bolts in. - Also all Mercedes wheels are HUB CENTRIC the weight of the car is supported directly buythe hub pressing into the center hole of the wheel and not by the bolts.
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post #8 of 9 (permalink) Old 04-22-2002, 01:46 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

Using bolts instead of studs makes it very easy to change from one wheel style to another, without rquiring the wheel manufacturer to machine recesses to get down to the right engagement depth for studs.<br> My C-class came with a steel wheel spare (albeit full size). The spare wheel kit has a different set of wheel mounting bolts, shorter than the standard bolts used to attach stock alloy wheels, to match the thinner steel wheel.<br> The down side is that on a stud-equipped car, ruin a stud or nut and you're only out a couple bucks and a couple minutes either way. If some idiot with an impact wrench ruins the threads on a Mercedes wheel hub, you'll spend several dollars putting in a thread insert, or substantial money replacing the hub.
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post #9 of 9 (permalink) Old 04-27-2002, 07:42 PM Thread Starter
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Re: Why does Mercedes use bolts instead of nuts for the wheels?

I have a 1978 450SL that I have restored. I need some chrome lug bolts for it as most are losing their chrome. These particular bolts are over three inches long.<br> <br> Frank
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