A quick and easy way to check your alignment at the track is by using a string. You can measure from the string to the framerail if that's your reference and then to each right-side tire sidewall. Make sure you're not putting the end of the tape onto a letter protrusion or anything other than the actual sidewall of the tire. If measuring at hub height, compensate for the cambers. To get the contact patches lined up, the RF tire will always be closer to the centerline of the car due to the added camber.