EX-RR ST2 w/ KR-415FHD short

No. 80643
End of production

New Steering Unit ST2
Expert Grip2
Latest version software Ver2.12
HCS compatible Receiver KR-415FHD Short

#Weight:536g (not included battery)
#Battery: RO3/AAA/UM4 battery x 4
#Current: 150mA
#Using time: 4 or 5 hours( with alkaline battery)
#Channels:4 channels 
# Model memory: 35
#HCS compatible receiver KR-418FH(21011) included.
#*This products does not include the Manual in the package.Please download manual from here.
#Other Compatible receivers: KR-415FHD,KR-413FH,KR-241FH,KR-211FH,KR-212FHG.
*If you use Li-fe, Li-po, you must use with our option unit (Battery stand Unit).

  • The new high end which sharpened operation feeling.​ EX-RR

    We thought of the operation feeling to the primacy by the development of RR. It is the operation feeling which operates a car really.We think that the feelings which can not be evaluated are important at the numerical value in each steering, throttle, software element.

    21.May.2021 We released EX-2/RR/LDT Xpansion Updata V2.15.


    New Drop down extension Unit 2

    Superior durability and operation feeling led by new angle sensor.

    We adopt new angle sensor which was particular about the durability and the feeling of operation for both steering and throttle. Prevents deterioration of durability and operational feeling due to wear, which can be said to be the problem of contact sensors. Along with smooth operation feeling by smoother sliding, we realize high durability that is approximately 100 times compared with the prior sensor. Therefore, the best feeling of operation can be maintained for a long time. In addition, the new sensor outputs a more linear signal to the Master Unit. You can control the ESC and servo with a detailed operation sense. A realization of a sense of unity between people and cars.

    Increased the number of ball bearings that support the steering shaft for higher accuracy!

    Increased the number of ball bearings that support the steering shaft for higher accuracy!
    The number of ball bearings supporting the steering shaft has been increased from one to two. The double-support type supports higher precision operation and reliability.

    The soft spring which can be operated with a constant tension.

    The normal spring included in the extension unit has been modified. The previous spring used was a progressive spring becoming stiffer as the wheel angle increased, but the new softer spring give a linear stiffness as the wheel angle increases. Since the spring tension can be adjusted, you can set the spring tension to your personal preference.

    Update software V2.12

    Xpansion software are update. This is latest version.

    Break-in function is added.


    This function is useful at break-in which many EP car drivers do for diff-oil maintenance and after ball diff assembly.
    You are able to fix the throttle to Low by setting a time limit before driving. This is a function to minimize the feeling change of the cornering characteristics due to the temperature change of the differential before a run.
    Not only the operating time can be changed but also the throttle input can be adjusted to your preferred speed. In addition, the break-in function starts with an assigned ET/BT key and the buzzer of the EX-RR sounds during operation so you can see immediately that the break-in function is activated. Also, in case of an emergency we have also equipped the function to stop in case of an emergency by operating the key again.


    Hand break function is added.


    In a real drift car, there is a method of pulling the hand brake while keeping the accelerator ON to make a better chance of a drift.
    We added a hand brake function that will allow us to use this technique that is very similar. Like an actual vehicle, even if you operate the throttle trigger the set amount of brake will be applied only while operating the assigned ET/BT key as long as the throttle trigger is operated. In addition to drift cars, this can be used for regular RC cars to create an understeer feeling.


    Other updates to  functions in XpansionV2.10

    #Added alert and changed operating procedure in the ALL REST function.
    #Display of 3CH/4CH positions is changed to display a Value (ex. NOW:+100)
    #Added changeable value in the Gyro mode of 3CH/4CH
    #Steering direct function is changed so that it can be stopped by adding to Steering > Travel menu.
    #Other small bugs fixed




    Included Expert grip 2 

    The newly designed throttle unit has increased the direct feeling.

    Renovating the form by lengthening the throttle trigger and operational angle. In order to not influence the operational angle, the distance to the finger from the angular sensor has created a more direct feeling while maintaining a compact and comfortable size. With the direct feeling of the throttle/brake reaction when moved, the increase of this linear feeling allows for a smoother and quicker reaction with input on the throttle and brake.

    Spring Tension Adjustment. 

    Trigger spring tension = personal preference. The new trigger unit provides a spring tension adjustment with a screw. This allows for a stronger or softer spring tension according to personal preference.


    Higher quality stylish wrapping.

    Master unit and Grip Panel have carbon fiber printing. Some screws used are aluminum for weight reduction. New degined Aluminum Wheel。


    KR-415FHD included

    Included receiver is the KR-415FHD which is compatible with the new HCS operation.
    Please try a higher response feeling using with the RSx3/BSx3 servos.

    Please detail of HCS is here.






    Function Summary

    Model Select / Model Name / Model Copy / Model Reset / All Reset/35 Models

    Display / Battery / Calculator / Sound / VR Information / Config / Key Speed / Menu Speed / Language / Operation time / User timer

    Steering Travel / Steering Balance / Steering Trim/Steering Sub Trim / Steering Trim rate / Steering Speed Turn(2way) / Steering Speed return (2way) / Steering Curve / Steering Punch / Steering Feel / Steering Response / Steering Auto Trim / Steering Auto Balance /Steering Reverse

    Throttle travel F / Throttle travel B / Throttle Trim/Throttle Sub Trim / Throttle Trim rate / Throttle Speed Turn(3way) / Throttle Speed reTurn(3way) / Throttle Curve / Throttle Punch / Throttle Feel / Throttle Response / Push Control/ ACCEL / ABS / Auto Start / Idle Up / Neutral Brake / Throttle Override / Throttle Reverse/Break-in/Hand-brake


    KEY Setting / 2WAY / 3WAY / 5WAY / ANALOG / Gyro / Twin Servo / 4WS/AMP Mixing / Throttle Mixing / Trim Set

    Timer Start / Trigger Start / Lap history / Start Stop Key / Lap Key / Lap Navi / Alarm time / Pre Alarm / Alarm Mode / Timer Mode (Lap Timer/Down Timer)



    Master Unit EX-RR ×1
    LCD Xpansion Unit EX-104S ×1
    Aluminum Steering Wheel 3 x1
    Drop down Extension Unit2 ×1
    Expert Grip Unit2 (right) ×1
    Normal stand unit×1

    Receiver: KR-415FHD ×1

    Other: RX mode selector x1

  • KR-415FHD Short Antenna

    End of production
    No. 21010


    No. 21011
  • Radios

    EX-LDT/EX-RR/2(XpansionVer2.12)Instruction Manual

    EX-LDT/EX-RR/2(XpansionVer2.15)Instruction Manual

    Radios Manager

    Xpansion Manager Software V2.12