MOTOR APPLICATION 1406-1900Kv Ideal for 1/10 scale low speed rock crawlers/trail runners on 3S-4S weighing less than 8lbs. Can also be used in more aggressive setups in lighter 1/10 scale touring cars, stadium trucks or buggies weighing up to 5lbs. Please refer to our Surface Product Selector for recommended motor, battery and gearing for some of the more popular vehicles on the market. MOTOR FEATURES: Our IMPROVED 4-POLE 12-SLOT design boasts exceptional EFFICIENCY and produces LESS HEAT. Oversized gold-plated solder tabs for LESS RESISTANCE and easy soldering. Our OPTIMIZED design eliminates the need for mechanical timing adjustments. Our sensor alignment method delivers uniform timing and torque in both directions, automatically. REBUILDABLE design allows users to replace front end bell/bearing assembly or rotor/shaft assembly. ROAR standard sensor port and labeled connections. Proudly designed and supported in Kansas, USA. Backed by Castle Creations 1-YEAR WARRANTY. COMPONENTS OF THE HIGHEST QUALITY: High strength 180°C grade neodymium sintered magnets 13 AWG high strand count wire with silicone insulation 6061-T6 aluminum heatsink can High quality, temperature-stabilized sensors High-purity, high-temperature copper windings High RPM NMB oversized bearings Hardened stainless steel shaft Stacked stator with high quality 0.2mm steel laminations Kevlar wrapped rotor