BD-508 Preload Adjustment Set for BD7 and BD5 by Yokomo  [BD-508]

BD-508 Preload Tension Screw and Spring for BD7/BD5

This Yokomo BD-508 kit is a compact adjustment set for BD7 and BD5 scale RC differentials, supplying a tension screw and a matched spring to modify differential preload. It is aimed at drivers who want to fine-tune traction balance and turn-in response.

The components install into compatible BD-series differential housings and allow you to change preload incrementally rather than replacing the entire diff. Use the kit when you need subtle changes to spool-up or roll resistance during tuning sessions.