Install these axle shims between your landing gear and axles to insure that your tires track true.
Correct any misalignment of toe-in or toe-out in 1/4" increments.
How to Select the Proper Axle Shim
1. Support the aircraft in level flying attitude.
2. Chalkline the center-line of the aircraft onto the floor. Do this by connecting a mark on the floor from directly beneath the center of the firewall (use a plumb-bob) and from directly beneath the center of the tail (also using a plumb-bob).
3. Place a 36" straight edge against the outside of the tire. It should be parallel with the floor and approximately centered on the wheel.
4. Make a mark on the floor directly beneath each end of the 36" straight edge. Use a plumb-bob or square for this.
5. Measure and record distances D-1 and D-2. These are the distances between the marks in step 4 and the aircraft center-line.
6. Calculate Delta D, which is the difference between D-1 and D-2. Delta D changes by 0.157" for each 1/4".
To Change Delta D by 0.10" - 0.25" Use 1/4" Shim To Change Delta D by 0.25" - 0.40" Use 1/2" Shim To Change Delta D by 0.40" - 0.55" Use 3/4" Shim