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KRG-1 - First build, 12S4P Trampa with custom concave


Hi guys,

Some of you may have seen this board on FB or Reddit, but I needed to create a topic here.
This is my first build, the KRG-1.
I’m French so I’ll use metric system.

Parts list:

Custom parts:

  • Battery undertray ends 3D printed in PLA (both sides)
  • Motor mount protections 3Dprinted in PLA
  • Trampa dampa 3D printed in TPU (softer than the yellow ones)
  • 3D printed concave extension un TPU (awesome if you ride without bindings)
  • Custom belt tensioners made with bearings and speed rings

All my 3D files are here:

Software :

  • Ackmaniac firmware
  • FOC mode
  • PPM + UART
  • Ackmaniac app on Android
  • NFC chip inside the remote. It launches Strava, Ackmaniac app and Spotify when I put my phone on the remote (and send a notification with “Good ride”! ^^)

The board went through different versions:




Under the board:

(my wife like heels…)

More photos:


Very pretty! Well done


Clean build! Please educate me a little- Whats the point of the custom concave? Also, Would you mind linking to some of the posts on reddit/ facebook that you mentioned?


Super clean MTB! The name kinda rings Keanu Reeves’ bikes too :sunglasses:

Did you program the NFC chip inside remote by yourself? Do you have a tuto for it?


It’s actually pretty easy, there’s an app for that! Like NFC Tools for example. No programming at all.


Concave allows better foot placement and carving with no bindings. And comfort.

Trampas are flat for two reasons: the manufacturing process and they are made to ride with bindings.

24 votes and 23 comments so far on Reddit


Just now realized that it’s not only grip tape :sweat_smile::see_no_evil:
Also didn’t understood where is your concave…now I got it :joy:
What you used to shape the concave?

Edit: …ok that’s I also found…too much threads…


1st build are becoming very good now, not like mine :slight_smile:
Very clean, congrats




@rojitor, new generation will never understand :disappointed_relieved:


If they use the search function enough they will.
*why i know

Dope build btw
Really great way to add concave


Awesome build, very clean. Looks proper professional, well done.


I thought I was digging deep enough in old storys…
looks like no.
Need more time to read here…maybe than one day I will understand it.

Edit: 5min later I found it… was already on the right way…:joy:


Very nice build!


First build?? :open_mouth:


:wink: it’s cause of all of you guys and this awesome forum and community !
You all could be proud,
but mostly, Big Up @Koringer !!! For sure this is a seek gorgeous 1st build :dizzy_face: :crazy_face: Love it since I see it !
To bad we couldn’t already make a ride. Once I get air tire we will for sure! I need to test your board so bad !!!
(Get my AT kit soon I call you when I’m ready :wink: )


Thank you guys :slight_smile: