The weight of a MB rotor is 11 pounds. Compare that to a powerstop or stoptech rotor.

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Cquence.net does not list rotors for my car.

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Here's what I found.

Zimmerman - 21.4 pounds

Stoptech - 22.0

Powerstop - 18.74

Brembo - 11.3

Mercedes - 11.0

So I'll go with Brembo. Mercedes tuned my suspension for light unsprung weight so I'll stay with the recommended guidelines.

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Where exactly are you obtaining those listed weights? Shipping information from online vendors? If so, you'd be remiss to rely upon that as accurately reflecting the true weight of each rotor. You're barking up a tree where there's no squirrel.

Applying a little bit of analytical thinking would be helpful. You'll note that the examples you posted reflect a difference roughly equal to a doubling of weight for certain examples versus others. So... what are you seeing? A single rotor weight versus a shipping unit of two rotors?

The outlier is the powerstop brand, which is likely: A.) an inaccurate listing, B.) showing the net weight vs. gross shipping weight (although a cardboard box doesn't weigh much), C.) they are lower in mass due to being skimpy (unsafe) garbage - where they use larger cooling vents to save on material costs while maintaining correct external dimensions, or D.) they are lower in mass than the others because they are exotic two-piece rotors, i.e., aluminum hats with steel friction surfaces.

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Current rolling stock:
2001 E55 183,000+ Newest member of the fleet.
2002 E320 83,000 - The "cream-puff"!
1992 500E 217,000+
1995 E300D 412,000+
1998 E300D 155,000+
2001 E320 227,000+
2001 E320 Wagon, 177,000+

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.

This, there's no way there's 10 lbs of difference between the heaviest and lightest. Assuming the same outer dimensions (because the rotor has to fit into the same caliper, and the hat has to be the same thickness), to add 10 lbs a foundry would have to add material to the inside of the rotor, eliminating the vents.

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URO Parts online catalog: https://apaindustries.com/catalog

I agree with the two previous posts. Most likely it is a one vs two rotor weight.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I use to cut bearing races up to 26 inch diameter on a cnc lathe. We used nickle,chromium steel, then heat treated and quenched. Bearing races then ground to final spec. We had some a year old grow up to 60 thousants. So we started after quench a nitrogen bath,to stablize metal. I have alway wanted cryro treated rotors. You should be able to get them hot,and go thru rain,with no warping.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt