EXTREMO - Scratch built 7kW billet frame scooter

Lightweight / Folding / Portable EVs - seats optional
HTTR   1 mW

1 mW
Posts: 15
Joined: Nov 06 2020 4:43pm

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by HTTR » Jul 23 2021 4:34am

Looks great and must feel even better to see the parts come to life as you say .... looking forward to seeing your progress

BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Jul 30 2021 1:28pm

quick preview of the ongoing assembly

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Last edited by BigBlock on Aug 01 2021 5:08am, edited 1 time in total.

BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Aug 01 2021 5:07am

getting closer with the 20S battery pack. I've tried for first time the copper + nickel sandwitch and it seems to work quite well.

I used 0,2mm copper bus bar with 0,15mm pure nickel strip on top -

Kweld @ 65J. The welds look a little bit burnt but they have a very good mechanical bond with the cell


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HTTR   1 mW

1 mW
Posts: 15
Joined: Nov 06 2020 4:43pm

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by HTTR » Aug 01 2021 9:20am

BigBlock wrote:
Jul 30 2021 1:28pm
quick preview of the ongoing assembly

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It really looks superbe and hope that it handles as well but as far as we can tell now it's clear that you have absolutely nailed the goad of the Vostok inspired design couple with a much simpler mechanical design. Fascinating project to follow.

StevieB-FPV   1 µW

1 µW
Posts: 3
Joined: Sep 12 2020 11:32pm

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by StevieB-FPV » Aug 24 2021 10:33pm

BigBlock wrote:
Jun 17 2021 10:31am
I finally managed to fit a 20s12p that will give ideal balance between performance and capacity.

Using Samsung 30Q I will end up with a 36Ah pack and 150A BMS

Going with traditional layout will allow to spread the series connection by all 12 cells (150/12 = 12,5A) that should be managed with easier weldable nickel strips (0,15mm) without going with copper or copper + nickel sandwitch.

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Care to share the 3D model file for the Fardriver controllers? please? :D

BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Aug 29 2021 5:37am

StevieB-FPV wrote:
Aug 24 2021 10:33pm
Care to share the 3D model file for the Fardriver controllers? please? :D
I modelled it very quikly for the fit check - it's accurate only in the dimensions that I needed

you can find the complete 2D drawing here: https://it.aliexpress.com/item/1005002326261717.html

BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Aug 30 2021 9:12am

I completled the assembly of the 72V battery pack - I preferred to keep the BMS outside of the vinyl wrap for easier maintanance.

the wiring management will be quite weird - still need to place the fuses and discharge resistors.

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BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Sep 09 2021 12:40pm

just completed the final batch of machined parts... now the fun begins :D

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BigBlock   10 mW

10 mW
Posts: 31
Joined: Jun 03 2021 11:37am
Location: Italy

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by BigBlock » Sep 09 2021 12:49pm

bearings pressed in place - the 30mm tapered bearing on the headtube feels stronger than many offroad bikes....

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HTTR   1 mW

1 mW
Posts: 15
Joined: Nov 06 2020 4:43pm

Re: EXTREMO - Scratch built 7kW billet frame scooter

Post by HTTR » Sep 15 2021 3:43am

Really nice to see this vision becoming reality. Thanks for sharing. This is really impressive from conception to execution ....

I wish we had a scooter design as an open source project where people could contribute as per their skill and tastes.

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