Road bike conversion 350W with in-frame batteries

DvH · Jun 24, 2019

Hi, i would like to share my 1st E-bike build. Tried to have it as minimalistic as possible. Spec:
Shimano TACX road bike
Aikema 350W rear hub motor, in 700C wheel. 6S06 controller
Battery 10S2P configuration. 21700 type Samsung 50E. Divided in 3 separate packs to fit in the tubes of the frame: 2x7 + 1x6 with BMS (more than enough to do the 25km commute)
Thumb throttle only
Total weight 15 kg
Motor assist up to 41 km/h

Einsgruber · Jun 24, 2019

wow this is a lush build... Ive been planing something like this for my bike which is similar

https://www.bikeradar.com/news/boardman-hybrid-team-just-in/?image=10&type=gallery&gallery=1&embedded_slideshow=1

I just need to find a small enough hub like the Aikema 350W but that has a disc adapter If you don't mind me asking where did you source yours and is it 24 or 36v?

Many thanks

E-HP · Jun 24, 2019

Can you share more details about how you got the batteries into the frame tubes?

DvH · Jun 24, 2019

The battery cells are inserted via holes in the front vertical tube with removed stem. The 3th one goes in the tube with removed seatpost. Not the best servicability but we’ll see...

Drunkskunk · Jun 24, 2019

That is impressive.

E-HP · Jun 24, 2019

DvH said:
The battery cells are inserted via holes in the front vertical tube with removed stem. The 3th one goes in the tube with removed seatpost. Not the best servicability but we’ll see...

Cool. I guessed the seatpost part looking at your cable routing, but wouldn't have guessed the top tube part of the pack. Is that little circuit board in the bag the controller?

icherouveim · Jun 25, 2019

Great Job!
Now you can race your friends or other bicycles without for them to know!

JimmyJazz · Jun 25, 2019

Very nice -- clean & subtle. I've always wanted to do the battery-in-frame, but I think you're the first DIYer that I've seen actually do it.

Matador · Jun 25, 2019

What he said ^
Super nice stealthy eBike!
Thumbs up!

DvH · Jul 19, 2019

Had Some issues with the tire alignment on the new rim so decided to respoke the motor into the original rim. Problem solved and looks better too..

E-HP · Jul 19, 2019

DvH said:
Had Some issues with the tire alignment on the new rim so decided to respoke the motor into the original rim. Problem solved and looks better too..

Blend in even more. :thumb:

How do you charge (in bike?)?

flat tire · Jul 19, 2019

Nice battery. Very creative. Your next mod should be a seat tube motor that connects to a special bottom bracket for total stealth. You can buy that off the shelf actually search "seat tube motor". It goes INSIDE the seat tube.

DvH · Jul 21, 2019

E-HP said:
How do you charge (in bike?)?

There is a charge connector inside the saddlebag, where also the BMS and controller are placed

cwah · Sep 22, 2019

Looks nice.

How harder is it to ride?

Turbotd04 · Sep 30, 2019

Nice! Proper stealthy

DvH · Jul 8, 2020

small update:
upgraded to 48V (added cells in downtube)
repaint
3D printed cable routing brackets

Wolfeman · Jul 11, 2020

Very cool build dude, clever.

maanebedotten · Jul 11, 2020

That sure is a most impressive build.

I would love some more info on how you made the holes in the headset tube.
Any worries about the structural integrity of the tube?

Matador · Sep 5, 2020

flat tire said:
Nice battery. Very creative. Your next mod should be a seat tube motor that connects to a special bottom bracket for total stealth. You can buy that off the shelf actually search "seat tube motor". It goes INSIDE the seat tube.

Yeah, they called it the "Gruber assist". But that moter is super crazy expensive (3000-4000 euros ?) easy to break and only good for 150W at the very most (more like 100-120W realistically).

I wish they made these much cheaper.

Matador

Road bike conversion 350W with in-frame batteries

10 µW

Attachments

10 µW

10 GW

10 µW

100 GW

10 GW

1 kW

1 mW

100 kW

10 µW

Attachments

10 GW

100 kW

10 µW

100 MW

100 mW

10 µW

Attachments

1 kW

100 W

100 kW

Similar threads