Firma 2100Kv Brushless Sensored Crawler MotorSpektrum SPMXSM3001 The Firma 2100Kv Brushless Sensored Crawler Motor by Spektrum is a quality built accessory. Excellent upgrade for 540 brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 1 8" mm bore) Perfect balance of speed and torque, great for trail and scale crawling applications High quality 4 pole sintered rotor Polarity protection magnetic encoder inside the motor guarantees consistency between
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