Shimming Your Car (Part 1)

One can increase the speed of an RC car by shimming. One very exclusive speed tip is to use shims to remove any unnecessary slop in your RC car. Excess slop reduces an RC car’s speed and makes it handle erratically. Shimming a trans simply means that the have the correct tolerances on each shaft or cluster of gears

If there is a gap between the hub and the axle pin, it causes undesired side to side movement; robbing an RC car of speed and making it handle erratically. One place to remove excessive slop is between the rear hub and the axle pin. We can do this by using thin plastic shims.
If you take a look closely at your model you shall find a thin plastic shim next to the ball bearing.

The inner hole and outer diameter should match the ball bearing’s dimension for good results. You shall need to assemble the rear hub, but to get result as your desire of increasing the speed, this time insert the plastic shim before inserting the ball bearing. The final assembly should result in a minimal amount of gap between the axle pin and the ball bearing inside the hub.

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