If you are using a direct drive wheel, set 'Wheel force' to the manufacturer's listed specifications and enable 'Use linear mode' We probably don't need to touch it just yet, but most users will want to change this from the default value at some point. 'Strength' is a personal preference, although generally stronger direct drive wheels will prefer lower single-digit numbers, while entry level wheels will prefer Strength values in the teens.
If you are using Load Cell pedals, set the Brake 'Force factor' to 0. IRacing’s in-game options control panel – Click “Strength” and it will change to “Max force” In iRacing’s options panel pictured above, you’ll see setup options for steering, brakes, force feedback and more.