Share 'Switching from 140mm to 160mm rear rotor: Big Deal?'

Until recently, my Felt F65x's been sporting a set of stock BB5s, but a friend of mine decided to send me his old BB7s. I use this bike mostly for gravel grinding and urban commuting, so no racing yet. Now the front brake, I had no problem swapping out: both were 160mm, and the front was always annoying me anyway because BB5s are a PITA to adjust. However, the rear brake is a 140mm, which means…