Depends on how strong your thigh is. A 1" bore will give less pedal travel, but require more effort. 15/16"D will require 12% less force, and 7/8"D 23% less. It seems that all new cars use power boosters, no matter how small the car, so I assumed a booster was needed for front disks. However, many here do fine with a manual MC w/ disks. We might call them "Team Big Thigh".
