Each electric skateboard use for 2 sets as below picture position:

Structure optimization: 
Split modular design: The bracket is assembled by 3-4 identical parts, which is convenient for mass production and can be adapted to different motor sizes. For example, the four segments form a ring support structure by means of L-shaped connecting rods, which are bolted between the segments 14.

Lightweight and strength balance: PA6 or steel plate material is used to increase the flange reinforcement at the gap, which both reduces the weight (such as the thickness of 8-10mm steel plate) and ensures impact resistance 56.
Accuracy of mounting interface

Positioning hole design: the connection holes between the bracket and the motor should match the size of the motor boss (such as a 10mm diameter slot +6 φ2.5mm bolt holes), and be distributed in a square shape with the equipment fixing holes (spacing 20mm) to ensure installation stability.

Error-proof structure: For example, V-shaped cavity and stop flange are set to help quickly align the motor housing positioning surface to avoid installation deviation