3650 4370KV 4P Sensorless Brushless Motor with 45A Brushless ESC（Electric Speed Controller）for 1/10 RC Off-Road Car

features enhanced throttle response,excellent acceleration, strong breaks and throttle linearity.
Motor
Features:
4 poles Hi-torque motor design.
CNC machined 6061 T6 billet alumium heatsink can.
High purity copper windings maximizes efficiency.
High RPM ABEC5 oversized bearings.
Universal fit all 1/10 brushless cars-multi-mounting system for M3 screws.
Precision balanced rotor, smoothness for best reliability and maximum RPM.
Stator - Super Thin (0.35mm) laminations.
Removable/replaceable.
Precision engineered for maximum energy conversion.
ROAR legal.
Specification:
RPM: 4370KV
Max Current: 66A
Max Watts: 820W
Can Size: 3650
Sensored: No
Can Diameter: 36mm
Can Length: 50mm
Shaft Diameter: 3.175mm
Shaft Length: 15mm
Bullet Connector: 4mm
Weight: 146g/5.2oz
Max voltage: 7.4V(2S)-11.1V(3S)
Note: there's some little error from human measuring.
Electric Speed Controller
Features:
Compatible with sensorless brushless motors.
High anti-interference capability.
Using advanced software interface to set up or update the software.
Super smooth and accurate throttle linearity.
Fast response to throttle input.
Mutiple protection features: low voltage cut-off protection, over-heat protection and throttle signal loss protection.