"Inboard Shimano Flat-Mount disc mounts on frame and fork (maximum 160mm rotors)."
I fit 160mm front and back on all our bikes, because I ain't got time to be dealing with 140mm rotors. I do have some 140mm lying about if you want to go that way.
It will be fine. I originally ran my 4SD with 160/140 but fucked the 140mm off because the more parts I can make the same/interchangeable the less I need to worry about.
"Inboard Shimano Flat-Mount disc mounts on frame and fork (maximum 160mm rotors)."
I fit 160mm front and back on all our bikes, because I ain't got time to be dealing with 140mm rotors. I do have some 140mm lying about if you want to go that way.