This optional part for RD2.0/SD2.0 combines an aluminum rear H-arm with a brass weight to systematically increase rear traction.

The highly rigid aluminum H-arm can be equipped with a separately sold weight to increase the unsprung weight that directly loads the rear tire, effectively increasing tire traction.

Unlike increasing the chassis weight, the load is applied regardless of pitching motion, so it slides well even when entering a corner, and maintains stability.

By adding 5g or 10g weights to the base 20g weight, you can control the load.