Yes. Try two sizes. The difference will be obvious. I run a seven-inch rotor on the front of my Salsa Fargo because I like to use a lighter touch on the brake lever. A six-inch rotor would still stop me. I would just need to apply a bit more force at the lever.

I like having the rotor in front be larger than in the back. That sort of compensates for the difference in stopping power between the two brakes. I'd run four-inches in the rear if I could find the right parts.

I will say that a downside to the larger rotor size is that it is much easier for a bit of rotor warp to result in a "ka-ching" sound as the rotor bangs back and forth on the pads. I've had enough trouble there that I may downsize to a six-inch rotor.