Thank you.
Unfortunately this seems to be a major issue, you have a problem.
Well…maybe first of all:
-
You can’t simply switch to the EVO three speed drive because single speed and 2 speed (Ø 60 mm) bottom bracket housing diameters are different to the EVO (Ø 95 mm)!
-
You also can’t simply replace the ATS drive - because you won’t be able to get a “naked” drive in hands; you are forced to buy a complete kit like that from bikegang/UK
https://www.bikegang.co.uk/store
(Look below Carry Me.)
This is some kind of region protection for Europe; here you must choose a Schlumpf drive (if you insist on drive only). -
You should not even think of disassembling without knowing exactly before what to do -
except you like, perhaps 30 or 50 little steel balls over/under your workbench.
The bearing balls of all these drives are not caged.
Just a few days I’ve stumbled upon this solution to change to an EVO drive, suitable for all Strida versions:
https://www.stridanederland.nl/en/shop/strida-evo-3s-upgrade-kit/
…and alternative the efneo three speed drive for single/dual speed Ø 60 mm bottom bracket.
Edit:
Ok single speed will be more durable…but do you really want that?
On a sidenote I want to add here that I’m very interested into the ATS drive, so much that I’d even buy a defective one like yours, just for education purpose.
The one I have here had a completely different behaviour in comparison to yours, therefore I’d be very curious to figure out why.