PSA : The original front disc of the RC 390 is HEAVY!!!

[psych0hans]

The front disc of the 2014 RC 390 weights 1.81 Kgs!!! It's INSANE!!!!


p.s. the scale is calibrated yearly and is accurate to the 10gms or less.

 

[Razor1]

If I remember correctly, I saved about 1 pound when I put on the larger KTM powerparts disc

 

[John390]

coming from automotive performance stuff, brake discs need to be massive. The mass is there to absorb heat. essentially, thats all we are doing when we brake. We are converting kinetic energy into heat. A wee bit of sound and sometimes some light, but normally just heat. Once the brake rotor can no longer store or shed heat as fast as its absorbing it, the brakes fade.

Trust me, I get light weight being paramount, but with brake discs, we need more mass, or so I have been taught