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What is likely to be the weight difference between a 203/180 combo and a 180/160 combo.
Taking into account the rotors are Shimano XT so alloy spider.
Would I notice the weight difference in everyday use?
Not at all. 15-25g difference I would say. Better off going for a poo before you ride.
Or have smaller rotors AND go for a stool.
Bikeneil, thats probably why you'll be quicker than me! 😆
I find that backing out a monster before a ride is most satisfactory.
if there is only a small weight advantage of smaller rotors why bother with them?
When I upgraded my brakes from avids to shimano XT, I found the 200mm rotor at the front gave me too much braking power. I like to have a bit of modulation rather than on/off that the larger rotor gave me. Dropping to 160 is perfect on the bouncer and run a 180 on the ridgid (29 er).
So to answer your question people select the size of the rotor primarily for braking performance. (torque = force x distance) the larger the diameter of the disc, the more braking force will be applied for a given lever effort.
I used to have 203/180mm discs, they rubbed more than smaller ones do, and I found the pads glazed easily, maybe not getting worked hard enough to get good and hot frequently enough?
Been on 180/160mm sets for years, now that my bikes more accurately reflect my riding rather than my aspirations 😉
Weight difference is in the region of 1g/mm
15 - 25g is a fart not a poo.