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I already changed the pads twice but I thinked that a rotor would last longer than that. Thanks for the answer !
Thms-
That sound about right TBH, some customer managed rotor at every pads wear, some haven’t changed their yet.
It’s varies on the condition and mileage you do, riding it through winter will accelerate wear a lots quicker, especially on disc brakes that’s likely to be contaminated by road grit.
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Edscoble is right, you've done a lot of riding! And indeed if the road threw up grit onto the rotor then it will have acted a bit like sand paper and increased the rate of wear.
To expand a little on the question of whether you should change your rotors, Centerline rotors are 1.83mm-1.85mm when they are new. Sram, unlike some manufacturers, do not give a minimum thickness for safe use of their rotors, so we have to use common sense. As the rotor becomes thinner it gets hotter more quickly, leading to it warping more easily and affecting the performance of your brake fluid as it is compressed (called 'brake fade'). Also, because the metal is being worn by abrasion (as opposed to cutting) it becomes rougher and wears down your pad more quickly, as Edscoble says.
So that's the information you need to make a decision. If your notice any of the above symptoms, it may be time to change the rotors. However, be aware that the small edge you noticed on your rotors is very common and not a cause for concern in and of itself. If you can access a vernier gauge, measure the thickness of your rotors. I personally wouldn't consider changing them until they are less than 1.5mm.
Hope that's helpful.
edscoble
GoSteady
6,000km isn’t low mileage by a long shot! Change rotor and pads, not changing rotor can accelerate pads wear and increase chance of piston pushing out too much with a thinner rotor.