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What's a Big Deal on Rotor Weight Reduction

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  • What's a Big Deal on Rotor Weight Reduction

    2009 S63 AMG Front Brake Rotors - OEM Alternative

    Originally posted by RacingBrake
    The only and best OE replacement/upgrade for S63/S65 in the market.
    http://www.racingbrake.com/RB-Iron-R.../mb-irk-04.htm

    Can you imagine how your S63/65 can improve in performance, handling, and save the wear in pad and tire etc., after shaving some 38 lbs total un-sprung weight.
    Originally posted by atikovi
    38 pounds off a 5,000+ pound car. HAHA.
    Originally posted by jenz

    Unsprung weight is a big deal
    Indeed. People tend to mis-understand or mix up between "Sprung" and "Unsprung" weight, here is a good illustration.
    https://en.wikipedia.org/wiki/Unsprung_mass




    In a ground vehicle with a suspension, the unsprung mass (or the unsprung weight) is the mass of the suspension, wheels or tracks (as applicable), and other components directly connected to them, rather than supported by the suspension (the mass of the body and other components supported by the suspension is the sprung mass). Unsprung mass includes the mass of components such as the wheel axles, wheel bearings, wheel hubs, tires, and a portion of the weight of driveshafts, springs, shock absorbers, and suspension links. If the vehicle's brakes are mounted outboard (i.e., within the wheel), their mass (weight) is also considered part of the unsprung mass. Effects of unsprung mass...

    ...... High unsprung mass also exacerbates wheel control issues under hard acceleration or braking. If the vehicle does not have adequate wheel location in the vertical plane (such as a rear-wheel drive car with Hotchkiss drive, a live axle supported by simple leaf springs), vertical forces exerted by acceleration or hard braking combined with high unsprung mass can lead to severe wheel hop, compromising traction and steering control. ...
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