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K 1595
Seatpost > StVZO

In the S311E version, the light is powered via a cable connected to an external power source. For example, to the battery of a bicycle with electrical pedal assistance. 

Features +

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Product Details
  • Features

    Patented seatpost with an integrated seat rail clamp. The seatpost tube features 5 holes in which the LEDs are enclosed.

    A cable with a connector extends out of the lower end of the seatpost tube for connection to the electrical system of the e-bike.


    27.2 / 30.9 / 31.6


    D27.2(350) / D31.6(350, 400)

    Color and surface finish

    Polished Silver, Matt Black

    Seatpost type

    2 bolt clamp, offset 9, mechanical stop

    Seatpost material

    Aluminum 6061 T6 

  • Light unit

    5 LEDs with integrated electrical light control and battery management system. The two upper LEDs are protruding, also ensuring the lateral emission of light. The lower 3 LEDs are sunken into the seat post tube. The LEDs, circuit board enclosed in a plastic housing and are thus protected (dust and splash proof in accordance with IPX5).

    Light Module

    2 wide angle red LEDs, 3 high brightness red LEDs



    Power Source

    The on-board battery of the e-bike. The rear light can be operated with 6V as well as with other e-bike electrical system voltages up to a maximum of 12V.

    The electrical connection is made with different cables and connectors in compliance with the relevant regulations.

    Nominal voltage

    DC 6V (6V 12V)

    Power consumption


  • ETC



    Seatpost test standard

    EN 15194

    Compliant with standard or directive

    RoHS, UN3481, StVZO §22a TA Nr.23 (Rear lights for bicycles), IPX5

    Package Contents

    Rear light seatpost

How to Use
  • Assembly

    Use the correct diameter corresponding to your bicycle frame.

    Use the appropriate tool to fasten the saddle support.

    Adhere to the safety lines of the minimum and maximum insertion heights.

    The rear light may only be operated in the following angular range: Max 76˚, Min 70˚.

    The lower two LEDs may be sunk in the frame. Always pay attention to the mechanical stopper of the maximum insertion depth!

    The rear light must be mounted in such a way that it is illuminated at the rear. The reference axis (see drawing) must be aligned parallel to the bicycle‘s longitudinal axis.
    The two lower LEDs may be inserted into the frame. The minimum insertion length into the frame is 100mm. The rear light must be aligned so that it shines backward. The reference axis (see drawing) must be aligned with the longitudinal axis of the bicycle. A mechanical stopper prevents the insertion of the seatpost to cover the 3rd LED(from the bottom) and damage to the two top protruding LEDs.

    Angle limits (Frame seat tube)

    Min: 70°

    Max: 76°

    Connecting to the power source

    The connector of built-in light seatpost and the connector of power source should be compatible, which must be ascertained before the purchase of the product. 

  • Function

    The rear light is operated by the light switch of the e-bike system.

    When switched on, all 5 LEDs light up.

  • Precautions

    At startup, the product must be dry. Remove any moisture before riding. After installation, test that the seatpost does not drop under load. Take care that the LEDs are not covered by a bag or clothing when riding. Do not make any independent changes to the product. Do not try to open the product.

    Steps to take in the event of a failure


    If either LED no. 4 or no. 5 is defective, the mode must be switched to the 3 LED mode to conform with the regulation. Repair or replacement is nevertheless recommended. If LED no. 1, no. 2 or no. 3 fails, the seat post must in any case be sent to the importer for repair or replacement.

    If either LED no. 4 or no. 5 is defective, the rear light may remain in operation. Repair or replacement is nevertheless recommended.

    If LED no. 1, no. 2 or no. 3 fails, the seat post must in any case be sent to the importer for repair or replacement.

    If you ride with the seat post low, it may be the case that the seat clamp covers one of the lenses. Please ensure that the clamp area is not directly tightened on to the lens as per the illustration below.

    Operating Temperature

    Min: -15° C

    Max: 45° C

    Optimum storage temperature: 20-25°C

  • Shipping
  • Returns and Exchanges
  • Warranty
  • Waste Disposal

  • 1273-39 Bamtijae-ro,
  • Geochang-gun, Gyeongnam,
  • 50147 South Korea