Another quick way to check and/or center the rack...
- Turn and hold the steering wheel all the way to the right and place a piece of masking tape at 12 o'clock.
- Then turn and hold the wheel all the way to the left and place a piece of masking tape at 12 o'clock.
- Then turn the wheel straight using the tape marks as reference (not the steering wheel spokes). On the R, the tape marks will be at about 10 and 2 o'clock. On the X they will be about 11 and 1 o'clock (I believe).
- If the spokes on the steering wheel are straight, your wheel is centered to your rack. If not, remove the tape, pull the wheel and center it.
Now your rack is centered and you can proceed. If one of your tires was rubbing (like you indicated) and stopping the rack from hitting one of the stops, then you may need to repeat the whole process after setting your toe to make sure you are still centered.