Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC

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Tekin’s RX4 is a versatile ESC designed for sensored, sensorless, brushed and brushless motor setups. 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 and the ability to run either Brushed or Brushless motors. Not to mention the RX4 housing is a thick-walled, reinforced Hardbox design able to withstand the elements and rough environments that come with true Offroad adventuring.

Designed to run Tekin ROC 412 and ROC 412HD motors:

  • 2S Lipo up to 4400kV
  • 3S Lipo up to 3100kV
  • 4S Lipo up to 2300kV


  • Easily Access Programming, Anywhere, Anytime
  • QuickTune One-Touch Programming
  • HotWire Compatible
  • D2: Dual Drive Mode Technology
  • On-Board Temperature Indicator
  • HDAC: High Density Copper FET Boards
  • Solder Posts for Easy Wiring
  • Heatsink and Fan w/ Auto-on-Temp Sensing
  • One-Touch Radio Calibration
  • High Voltage BEC
  • DATA Logging
  • Waterproof hardbox design

Programmable Features:

  • DB: Drag Brake (13 steps)
  • BS: Brake / Reverse Strength (13 steps)
  • LM: Torque Limiter (7 steps)
  • NW: Neutral Width (13 steps)
  • TP: Timing Profiles 5 Presets - 2 Custom
  • MT: Brushless Modes: Fwd/Brk, Fwd/Rev, Rev Delay; Brushed: Fwd/Brk, Fwd/Rev, Fwd/Rev Delay
  • VC: Voltage Cutoffs: 2S, 3S, 4S and Custom
  • Extensive Tuning via Tekin HotWire (sold separately; TEKTT1451)
  • Custom Throttle Profiles
  • Adjustable Throttle and Brake Minimums
  • Adjustable Throttle and Brake Frequencies

Input Voltage: 2S to 4S Lipo
Continuous Current: 240 Amps *per phase
BEC: HV 6.0V-7.4V / 8 Amp Switching
Motor Type: Brushed/Brushless, Sensored/Sensorless; 2Pole or 4Pole Motors
Motor Limit Brushless/Brushed Mode: No Limit
Dimensions: 1.6 x 2.0 x 1.4” / 40.6 x 50.8 x 35.5mm
Weight Approx: 2.65oz / 75.5grams

Verified Owner
Tuesday, Sep 22 2020 (5 months ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
I bought this RX4 and connected it to a ROC412 3000KV motor and a 3S lipo battery. I also connected a hotwire 3 box to it. So far i like my mamba x better for low speed control. Using the same motor i cant get the low speed start up to be as smooth as the Mamba X. This ESC seems like it would be better for bashing than crawling.
Monday, Nov 12 2018 (about 2 years ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
I put this plus a ROC412HD 1800KV motor into my heavily modified TRX-4, and the performance is awesome. It's just like the 3 RX8 Gen 3's that I have in my Tekno rigs, only it's a sweet crawling setup...
Verified Owner
Tuesday, Jan 12 2021 (7 weeks ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
So far so good. Only been a week but it is great especially with the Hotwire. Easy to use and understand. No issues. Thanks again Tekin for a great product and support. Thank you to Amainhobbys for their great service and support also they are very helpful and friendly.
Verified Owner
Thursday, Dec 17 2020 (2 months ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
Finally finished a TF2 with my r 4. Worth the money and more. With the Hotwire 3.0, program if was too easy. Took it out in our first descent snow, no fender wells, the entire chassis was layered in anout 3 in his of snow by the end. Rx4 with a sensors roc 412 was just fine. Even after I let it dry over warm air and water drained all over it it was just fine. Won’t put anything else in my future off road projects.
Verified Owner
Tuesday, Oct 6 2020 (5 months ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
easy to use, not as tall as rx8, cool grey color, used on my yeti and smt10. highly recommend the hotwire to tune it with your phone.
Friday, Aug 23 2019 (about a year ago)
Tekin RX4 Hardbox Waterproof Sensored/Sensorless D2 Crawler ESC
Great ESC! Previously had a castle mamba x (horrible esc) and then it burnt out at axialfest. Bought my RX4 and couldn't be happier