Stromer ST1x

[Sinhu]

Hi !

A new project pop’t up

As i live in Norway where a couple of Stromer dealership’s as come and gone. At the moment it’s posible to pick up these bikes at a very reasonable price if they got a problem.

Stromer, if you contact them ask you to go to the nearest dealership thats in Denmark or Finland

So i picked up this Stromer ST1X 2019, used about 2000km with a drive error msg on it.



The reason for error msg was one of the cables from the hub motor thats been rubbing against the break disk



After testing motor and sensors, replacing conectors the error msg still pop’s up.
So i need a Stromer sw to delete it, worst case new controller

So the Stromer ST1x rebuild has started, after looking evrything over i think i will try to make this rebuild looking as close to the original as possible.

Taking out all the parts i can’t use, this is what’s going to be sold as parts.



Test fit a Baserunner in the slot after removing the Stromer display, and it fit great

Found the real reason of the problems with the bike.



Without any torque arm the motor has turned in the frame

Not very impresed with the torque handeling of Stromer in this model.



Making a atempt of a new torque handeling solution, drilled and treaded a m4 just at the edge, using a m4 z- srew and grinding a slit in the motor shaft to fit.

Not sure if it’s enough



Had to go up to M5 and mounting a welding nut on the inside. Grinding a slit in the motor axl to fit the welding nut, and i can’t understand otherwise then this should work.



Still som grinding to do



After leting the bolt and nut sit over night in epoxy and grinding it down so the thru axl bolt runs free.

Test fitet the wheel and it seems to work like a charm, i’m very happy with this work around


It’s time make a new battery for the bike.
The top of the Stromer battery pack are a integrated part of the locking mechanism, so using a old empty Stromer case i will fit a 14s5p pack with 30A daly bms

To be clear i get help spot welding and do the finishing asembly of the battery. I got in thouch with a realy good helpful battery builder a couple of year back, that pasionsly guided me to understand the fundementals in battery and building powerpack’s. So do you live in Norway, Batteryfix in Porsgrunn and Roger is where i got buildt countless batteries





Finaly decided on controller and the new set-up, and placed a order for the new parts at Grin.



Finishing the battery in a old empty Stromer case i had from before.

View attachment 12






Finaly i got all the parts, and now the rebuilding starts

Fiting new wiring and electronics in the bike is a nightmare… but getting there

And the baserunner in the upper frame, as i’m using a Cycle analyst as display and using the top of the Stromer display as a lid over the baserunner i try to make it look less like a display not working









Evrything looks good, just waiting for a new PAS for the isis crank

Out for a test run, and a bit of tweeking with the setings the bike runs like a dream. Lots of power and fast





Only to tidy up some wiring and it’s ready for spring

 

[Vbruun]

Incredible! Those are nice bikes, I would like one for myself

Really nice conversion. Where do you find them for sale?

 

[Sinhu]

Incredible! Those are nice bikes, I would like one for myself

Really nice conversion. Where do you find them for sale?

If you are a Stromer owner in Norway, and have a problem with your bike you are in trouble.

Ad there’s no longer a Stromer dealership or partner in Norway you have no where to go. If you contact Stromer ch they just ask you to contact your nearest dealership (in my case is in Denmark and 800km away)

And with the can-bus systems they use it’s not possible to do much without Stromer SW.

If the bike have a problem it’s not a easy bike to sell, and you can pick them up for a steal

Sold the battery to a Stromer owner in Denmark, so now i have a high quality bike for a low starting cost thats make a great project

 

[Vbruun]

I'm from Denmark and would like one! What sites do you look at?

I don't think your torque solution is adequate. Consider buying one of the chinese torque arms IMO

 

[Sinhu]

I'm from Denmark and would like one! What sites do you look at?

I don't think your torque solution is adequate. Consider buying one of the chinese torque arms IMO

Well usually find them on www.finn.no

This is a thru axl motor and no orignal torque arm or anywhere to mount one

So i have to try a homemade version

 

[Bigwheel]

Nice job Sinhu I like a project that turns out to be freeish! Should give you good performance also. Seems like the torque solution should work as long as you don't beat on the bike.

And to the Danish guy the price might not be so low there because there are dealers in your country?

 

[Sinhu]

Nice job Sinhu I like a project that turns out to be freeish! Should give you good performance also. Seems like the torque solution should work as long as you don't beat on the bike.

And to the Danish guy the price might not be so low there because there are dealers in your country?

Thank you

As a starting point for a ebike build you can’t do any better then a Stromer frame, it’s just solid and well buildt with high quality parts.

As the motor are from TDCM i’m looking forward to finaly try it

Stromer has as all the major brands gone for Can-bus and elektronic design thats take away any posibility to do any repair or customation without Stromer sw.

But it is / was supriseingly easy to rebuild this bike, lots of room for internal wiring. The battery compartment easily fit a custom 14s5p, the controller left enough room to hide all connectors.

And now it’s time to order the last parts from Grin, Cycle analyst v3 with the MF switch. With the Phasrunner i’m planing on running 40A and about 2000W. The orginal TMM torque sensor works perfect with CA.

So come easter time it will be a brand new Stromer on the road

 

[Vbruun]

Nice job Sinhu I like a project that turns out to be freeish! Should give you good performance also. Seems like the torque solution should work as long as you don't beat on the bike.

And to the Danish guy the price might not be so low there because there are dealers in your country?

Denmark is close enough that the blues can be shipped pretty easily.
The Prices are around 4000 euro for a bike in DK so might be Worth it