Aftermarket rotors?
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Typically, going bigger means more weight. If you go bigger and lose weight, you're lookin at very high prices (ceramic, CF brake rotors, etc.)
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17,697 Posts
I don't know of a company that makes lightweight rotors either. I've heard good things about the StopTech slotted rotors in terms of braking, but I've never read anything about lighter rotors.
If you can find a two piece rotor, the center section is usually made of aluminun so the overall weight if the rotor will be less. If you have the Brembos, I believe that Stoptech makes 2-piece replacements for them. I don't think that I have ever seen 2-piece non-brembo replacements.
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16,332 Posts
they will not affect rotatation inertia. Without going into a physics lesson:
Mass affects acceleration in a line
Inertia affects rotational acceleration (i.e. wheels, flywheels, axles, etc...)
You will never see a difference in your car's speed or acceleration by going to heavier rotors.
Isn't mass related to inertia? The larger the mass the more inertia. Acceleration is a change in speed or direction. It is easier to accelerate a smaller mass than a larger mass. I can be easily corrected, but according to Newton's second law of motion doesn't
acceration = force/mass? Acceleration and mass have an indirect relationship in that the
smaller the mass (inertia) the larger the acceration with the same force (force = m x a),
likewise, the larger the mass the slower the acceleration. If you have a car with 300 hp and 300 torque, the car with less mass will accelerate at faster rate.
With all that technical talk, I would put my money on the lighter car/with lighter brakes
accelerating at a faster rate. Let me know what you think?
acceration = force/mass? Acceleration and mass have an indirect relationship in that the
smaller the mass (inertia) the larger the acceration with the same force (force = m x a),
likewise, the larger the mass the slower the acceleration. If you have a car with 300 hp and 300 torque, the car with less mass will accelerate at faster rate.
With all that technical talk, I would put my money on the lighter car/with lighter brakes
accelerating at a faster rate. Let me know what you think?
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I disagree and this and here is why. Inertia is related to Mass but is more dependant on WHERE the mass is located. Why do you think ice skaters have to tuck in their arms and legs to spin so fast? The further away mass is from the axis of rotation (i.e. axle) the more impact it will have to the inertia. Rotors are right on the axle. Compared to the wheels and tires which spread further away from the axle and collectively weigh in around 50lbs each, the rotor has minimal impact on the Inertia.
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24 Posts
I dont know the physics of it but I'm petty sure that the reduction of unsprung weight has a great affect on vehicle performance. I'll do some digging to see if I can come upwith more info.
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182 Posts
A 2 piece rotor will weigh less than a one piece - so, for marketing purposes, yes there are lightweight rotors.
However, the most important aspect is having a rotor that interacts well with your intended pad. Unsprung weight aside, you'll have a FAR more capable car selecting a proper set of rotors that suit your needs than automatically choosing the lightest rotor on the block.
However, the most important aspect is having a rotor that interacts well with your intended pad. Unsprung weight aside, you'll have a FAR more capable car selecting a proper set of rotors that suit your needs than automatically choosing the lightest rotor on the block.
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