What’s My Rollout?

Roll Out (for Practice Tree Users): Roll out is the time from when you react in the car until the car rolls out of the stage beam. There are 2 options for setting roll out in a practice tree. You can set the roll out to the value that you need so that you can leave when you see the light (i.e. adjust your vehicle to you), or you can set the roll out to the value that your car currently has (bring yourself to the car). Portatree recommends the former as it is usually easier to adjust your car rather than yourself.

The roll out of a vehicle depends on a lot of factors including weight, converter/clutch setup, transmission setup, front tire size, shock settings, and launch RPM to name a few. It also depends on how you stage (shallow, deep, etc). If you plan to practice with the exact roll out of your vehicle, a good starting point is the weight of the vehicle (with you in it) divided by 10,000. With this approach, a car that weighs 3200lbs would require a 0.320 rollout. If you launch higher than 3000RPMs, subtract 0.010 for every 1000RPM over 3000 that you launch. If your front tire is larger than 26”, add 0.007 for every inch larger that you run (similarly subtract 0.007 for every inch smaller). If you deep stage, subtract 0.080 to 0.100 from the roll out number that you find. Rollout is not an exact science. If you begin practicing and feel that the results are much different than what you experience at the race track, do not be afraid to adjust the roll out.

If you would prefer to move your car and practice with the rollout number that you need, try the following exercise:

1.) Setup the practice tree with a 0.500 pro tree (for sportsman tree and 0.500 pro tree users) or 0.400 pro tree (for 0.400 pro tree users)

2.) Set the initial roll out to 0.001

3.) Perform 10-20 repetitions (they will all be red, this is okay)

4.) Order the repetitions from quickest to slowest

5.) Remove any outliers (anything much different than the rest)

6.) Find the median (the middle number) and make it positive

7.) Add your target reaction time to the median

8.) Use this number as your rollout

As you improve, you may need to repeat this exercise. Some racers become quicker as they improve their button/pedal/breathing technique.