Currently my bike has cable actuated disc brakes, which I will upgrade to Ultegra 8070 callipers and RT-800 Ice Tech rotors. I use the bike for road, some gravel and bike packing.
The current rotors are 160mm front and rear. The rear rotor is a pain when I remove my rear wheel: due to the rear derailleur I need to move the wheel slightly forward to remove it and I end up scratching my frame with the rotor (the non-drive chain stay, even when I am careful). After 2 years of doing this, the frame has lost quiet a bit of paint...
Because of this I am thinking to put 140mm rotors in the rear. But I am nervous about this for bike packing use. I weigh about 80KG and worst case my gear would be about 10KG if I would ride with a pannier.
Obviously I don't want to get in a tricky situation by overheating my brakes, but I am also fed up with the scratching and want to apply some clear coat on the exposed aluminium.
Q: Should I be fine with 140mm rotors on a (medium mountainous) bike packing trip given my weight?