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- Red leopard BM-2850-1890KV Class Inrunner Brushless Motor for car -new design,four-pole rotor,the overall efficiency of more than 90%; -extremely low temperature without additional heat sink can meet the vast majority of applications; -compared to competitive products,lighter weight,higher torque; -use of high-quality materials:aluminum alloy shell fine,high-quality magnetic steel,high temperature wire,imported high-quality bearings; -rotor using special materials reinforced,high-speed operation under the non-burst phenomenon; -good heat dissipation ,high overload capacity ； Low electromagnetic interference; -minimum required electrical maintenance; -long life Model Max Amps Li-poly Cells Max Power KV Fixing screw diameter Shaft Shaft Length Diameter Weight mm mm mm x length g BM-2850/1890 29A 3-6s 880W 1890KV 5mm 3.175 14 28.0×52.0 135g