Motor Diameter: 1.41?(35.85mm) x Motor Length: 2.09?(53mm), Shaft Dimensions: 0.60"x0.125"(15.3x3.18mm), Weight: 6.3oz (180g) * 10.5 Turn; 243 Watt; 4,500Kv; 12.5mm Rotor * Removable/Replaceable Powerful Sintered Neodymium Magnet Rotor * High Power Solder Tabs, High RPM Output, and High RPM Precision Bearings * Legal in Major Governing Race Bodies: ROAR, BRCA, EFRA, JMRCA, Tamiya TCS.