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there are 355mm "bbk" options and they are far less weight than oem brakes. some of the weight is from lighter calipers, some is from lighter rotors, and most is from using aluminum rotor hats.
in relative terms of braking tech- more mass in the rotors doesn't necessarily mean more thermal capacity. these rotors are designed to get rid of heat, NOT to hold onto it. so having a high "capacity" isn't important. getting rid of heat is more important than how much they can hold.
this is why i just shake my head and usually keep my fingers off the keyboard when i see these threads- or other threads about retrofits. people shunning the "bling" kits saying they are just for looks when they themselves are trying to move to something more aesthetically pleasing to the eye while burning money on a nominal upgrade when the rotors are by far the weakest link.
the amount of misunderstanding in this thread is mind boggling when there is so much good brake tech on this forum.
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