Tekin’s RX4 Brushless Sensored Crawler ESC is designed to power your chassis past any obstacle. With massive power handling capabilities, a waterproof* design and all the customization features you’d expect from a Tekin ESC; the RX4 has you covered no matter the situation. Not only reliable, this ESC has a host of built in features like a High Voltage BEC, Drag Brake, Data Logging, Voltage Cutoffs for LiPos, HotWire 3.0 Bluetooth Connectivity and the ability to run either Brushed or Brushless motors. The RX4 defines versatility.


The RX4 Housing is a thick-walled, reinforced Hardbox design able to withstand the elements and rough environments that come with true rock crawling and off-road adventuring.


Rocks, Dirt, Snow, Sand, Mud, Trail and Track; the RX4 is no-limits RC fun.







1:10 4WD Trail Truck

1:10 4WD Rock Buggy

1:10 4WD Comp

: Forward/Brake/Reverse

Input Voltage: 2S-6S LiPo

Motor Limit Brushless Mode: 2S -  5700kV 4-pole

                                                        3S -  3500kV 4-pole

                                                        4S -  2300kV 4-pole
                                                        5S - 1800kV 4-pole
                                                        6S - 1200kV 4-pole

Motor Limit Brushed Mode: No Limit

Max Current: 240amps per phase*

BEC: 6.0v / 7.4v @ 8amps

Dimensions:  1.6 x 2.0 x 1.4" / 40.6 x 50.8 x 35.5mm

Weight: 2.65oz / 75.5g




*per manufacturer specs

HardBox Waterproof Design *

<<On The Fly Drag Brake Adjustment>>

High Efficiency Heat Sink and Optional High RPM Fan

QuickTune™ One Touch Programming

Adjustable Torque Control ***

Adjustable Throttle and Brake Frequencies ***
HD High Voltage Programmable BEC ***
HotWire™ Programming Port ***
Data Logging Capability ***
Sensor Checker

One-Touch Radio Calibration
On-Board Temperature Indicator

ESC Self Diagnostics with Error Codes
Fully Proportional Forward/Brake/Reverse

D2: Dual Drive Mode Technology

Brushless and Brushed Motor Drive

Sensored or Sensorless Operation

LiPo Safe with Custom Voltage Cutoffs

Sensor Plug for Precise Commutation

HDAC: High Density Copper PCB's
Ultra-smooth and Precise Throttle and Braking Control


* Waterproof in sensorless operation only. Element Proof ESCs and Motors are specially designed to withstand water splashes and are not meant to be submerged. Included dielectric grease must be used on the sensor connections to protect them from shorting.


**The RX4 is not intended for operation while submerged in liquid.

*** requires HotWire™ sold separately.



DB - Drag Brake (13 steps)

BS - Brake Strength (13 steps)

LM - Torque Limiter (7 steps)

NW - Neutral Width (13 steps)

TP - Timing Profiles 5 Preset - 2 Custom*

MT - Motor Type

Brushless Modes - FWD Only / FWD-REV / FWD-REV Delay / FWD-REV Delay REV Motor Direction

Brushed Modes - FWD Only / FWD-REV / FWD-REV Delay

VC - Voltage Cutoff : 2S, 3S, 4S, 5S, 6S, Custom*

* requires HotWire™ sold separately.

Take advantage of the free HotWire App for Tekin ESCs. Get Connected and gain access to all of the programmable features in your ESC to dial in brakes, throttle, voltage cutoffs, view data logs and more! Mobile versions available on iTunes and Google Play.





Update ESC Firmware

Create, Save, Load and Share Custom ESC Profiles
Drag Brake (0-100 steps) <<video>>

Active Drag (ON/OFF) <<video>>

Brake Strength (0-100 steps) <<video>>
Brake Minimum (0-30 steps) <<video>>

Active Braking (0-6 steps) <<video>>

Brake Frequency (750hz - 12kHz) <<video>>
Throttle Minimum (0-30 steps) <<video>>

Throttle Frequency (2kHz - 12kHz) <<video>>

Torque Limiter (0-10 steps) <<video>>
Reverse Speed (0-100 steps)

Reverse Delay (0-2seconds)

Neutral Width (0-100 steps) <<video>>
Push Control (0-100 steps) <<video>>

Timing Profiles 5 Preset - 2 Custom <<video>>

Throttle Profiles 5 Preset - 2 Custom
Dual Drive Mode

Motor Type <<video>>

Brushless Modes - FWD Only / FWD-REV / FWD-REV Delay / FWD-REV Delay REV Motor Direction

Brushed Modes - FWD Only / FWD-REV / FWD-REV Delay
Reverse Motor Direction
6.0 / 7.4V High Voltage BEC

Voltage Cutoff - 2S, 3S, 4S, 5S, 6S, Custom Per Cell <<video>>
Fan ON/AUTO Modes


Drive where you want, whenever you want with the Tekin Element Proof products!

The RX4 and ROC412HD power our 18.3lb custom Dakar Rally Truck!

Check out the installation, soldering and setup of an RX4 and ROC412 system!




TT2000 - RX4 ESC



TT1451 - HotWire 2.0
TT1452 - HotWire 3.0 BLE



TT3842 - RX4 Case Top



TT3806 - Tekin Power Switch

TT3808 - Receiver Plug 250mm

TT3809 - Sensor Cable 150mm

TT3810 - Sensor Cable 200mm

TT3811 - Sensor Cable 100mm

TT3813 - Sensor Cable 275mm

TT3825 - GEN2 HotWire Adaptor




TT3833 - RX4/RSX Fan Pack (2)






We guarantee our ESCs to be free from manufacturer defects for 180 days from date of purchase. All items are tested in a controlled environment prior to the packaging process to ensure you receive a top quality Tekin product. We strive to provide the highest grade professional components possible and we appreciate and treat every Tekin user as part of our family. We are RC enthusiasts designing and manufacturing quality products to give our fellow RC enthusiasts the best hobby experience possible.


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