All vehicles must display numbers on body panels on both sides, which must be readable by Timing & Scoring, Course, and Grid workers at all times. Vehicles may include class letters, and if included they should be positioned adjacent to the numbers. When used, class shall be represented by the upper-case abbreviated form rather than be spelled out.

1. All numbers and any class letters should use the same typeface and the same color, and this color must provide adequate contrast to the background color.

2. Generally, numbers should be a minimum of 8 inches (20.5 cm) high with a 1.25 inches (3.25 cm) stroke. Class letters must be a minimum of 4 inches (10.25 cm) high with a 0.75 inch (2 cm) stroke. When used, the height of the class letters should be between 25% and 75% of the height of the numbers. Stroke width should be at least 10% of the height.

Note: We're using the word "should" here because we don't want anyone to fail tech because their numbers are 7.75 inches tall but otherwise very readable. But please, make some big readable numbers. Make sure they are heavy contrast and easy to read when you're going 100 mph, 100 feet away. Numbers are awesome. Bigger numbers are awesomer. Number plates with easy-to-read numbers are wicked cool as well. Peeling those little numbers off your neighbor's mailbox as you're leaving for the event and putting them on the car is not cool for so many reasons. Let us know you love being seen on track.

3. Numbers should be able to withstand high speeds and variable weather conditions.

Note: This doesn't mean you can't use tape, but it does mean you should think about how well it's going to stick in all kinds of conditions. Magnets should probably have at least the leading edge taped into place. Our feet get sore walking around helping you look for them on track at the end of the day.

4. For Nationals and National Tour competition, current official SCCA® required decals must be displayed on each side and front of the vehicle in a prominent location. For Nationals and National Tour events, official SCCA®-approved National sponsor identification logos must be displayed in an upright position, in a prominent location on each side of the vehicle.

5. Additional sponsor and/or event specific decals may also be required; refer to event supplemental regulations.

6. We're not going to be sticklers about other sanctioning body decals showing up (yet), but know that if they are on your car you have very little chance of being famous on our website. Or, we may photo-edit the logo of our choice onto that spot on your car. (Other than #GridLife and Global Time Attack decals, because NATA for life, yo.)

Tire Rack SCCA Time Trials National Tour Powered by Hagerty - Decal Placement Sheet

We know some people might be a little concerned about the stickers and residue on your paint (although we haven't seen them do damage to paint in good condition). If you are worried about removing the stickers from painted sections, a couple of tips from experienced drivers are to put them on over the blue “painters tape” or press the sticky part against your shirt or a shop rag to pick up a little lint which makes them easier to pull off.