Tekin's PRO4 HD Motor raises the bar in off-road power. The PRO4 HD's longer 550 can and 4-pole design provide performance gains across the board and off the charts when compared to standard 1:10th scale motors. The PRO4 HD has the torque and power to level the competition. Designed with kV options for use with 2S, 3S and 4S power systems, 1:10th 4WD Short Course has never had this kind of power! Combine the Pro4 HD with an RX8 GEN2 ESC in your 4WD Short Course and hold on! Input Voltage: 2S - 4300kV / 3500kV 3S - 3000kV / 2500kV / 1850kV 4S - 1850kV Weight: 221g / 7.8oz Shaft Dimensions: 5mm (.196") x 15.3mm Motor Diameter: 35.8mm / 1.41" Motor Length: 62.5mm / 2.50" Bearing Dimensions: Front: 5 x 14 x 5mm / Rear: 5 x 11 x 5mm Rotor Size: 18.5mm *all Rebuildable: Yes 4 Pole 12 Slot Hi-torque Motor Design ​ CNC Machined 6061 T6 Billet Aluminum Heatsink Can ​ 4WD Short Course Specific ​ 5mm Output Shaft ​ Neodymium Sintered Magnets ​ Rebuildable Design ​ High Purity Copper Windings Maximizes Efficiency ​ Precision Engineered for Maximum Energy Conversion ​ Dual-Plug Sensor Wire Harness for use with all censored and sensor less systems ​ High RPM ABEC5 Oversized Bearings