Add thrust angle

The thrust angle is where the rear axle points the car, compared with the body. Rim Reader reads the body at the front doors’ window glass: two readings at each door.

Before you start

• Before Start, tick Thrust. Rear ticks itself and stays ticked.
• Front windows fully up, doors shut firmly, nobody in or leaning on the car.
• Wipe the glass directly above the rubber strip at the back of each front window.

The doors in the lap

1. The lap starts at the left front door. Place the bracket flat on the window glass, screen facing you, FRONT pointing to the front of the car, in the bottom right corner of the window: the back corner. Hold it gently; don’t press. There is no level to watch. It buzzes when it has the reading.
2. Remove it from the glass and set it back on the same spot for the second reading.
3. Do the rear wheels as usual.
4. On the way to the front, the app asks for the right front door, in its bottom left corner, twice.
5. Finish the front wheels.

Bracket on the Door Glass

Play

The result

• Thrust shows in the middle of the car drawing, in degrees with L or R. Within 0.10° it is called straight, because a door can hang slightly differently from its twin. (The ±0.15° in the generic targets is the pass mark for the spec check, a separate thing.)
• When the thrust angle is over 0.10°, each rear wheel is shown against the car’s body, so the wheel that is off shows the bigger number.
• If a door’s two readings disagree, the bracket is knocked, or a door is read more than a minute and a half away from the wheels, the app gives up the thrust angle for that lap and keeps the wheel numbers. The thrust angle never costs you the wheel numbers.
• Want to drop it mid-lap? Skip thrust angle, under the car at a door, drops the doors for this lap after asking once.