The Mi9 and Mi10 has been refined in many key areas, optimising its centre of gravity, unsprung mass and reducing its polar moment of inertia with tactical weight reductions. With this in mind, we have introduced a motor mount weight allow for the perfect placement of additional weight in order to meet weight regulations in the best possible way. U8816 Motor Mount Weight 25g which allows power roller to be fitted, maximum pinion size 37T 48dp 50T 64dp. The weight is attached to the kit motor mount.