PeachParts Mercedes-Benz Forum - New rotor question

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Quote:

Originally Posted by t walgamuth (Post 4019197)

20# per wheel more than the stock rotors? Seems impossible. I'd check that fact. I'd never put an extra 10# onto my unsprung weight per wheel. It will make it ride like a truck and hurt handling. I can feel a difference of 4# per wheel.

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

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Quote:

Originally Posted by lsmalley (Post 4022439)

check out cquence dot net

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.

Quote:

Originally Posted by RunningTooHot (Post 4022529)

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.

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.

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

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.