Tamiya #54393 Type 380 Sport Tuned Motor This is a new Type 380 Sport-Tuned Motor for RM-01 and TA05 M-Four chassis.When used with the model”s standard gear ratio, it offers a higher top speed and improved acceleration than Type 380-S motor (Item 51487).Includes: Type 380 Sport-Tuned Motor x1Technical Notes:Pre-wired cables with standard connectors.Motor Shaft Diameter: 2.3mmCompatible with RM-01 and TA05 M-Four chassis machines.Note: Not compatible with Item 58470 Holiday Buggy (2010) & Item 58500 Sand Rover (2011).