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These wheel's are too small & too many teeth (36t against 33t). Also, the teeth on the ones on Aliexpress are a straight cut. Whereas the ones on the Carrera's are slightly angled. I'm on with some lads who are trying to see if they can 3D print me some off. These "should" work "if", the bearing...

I'm in the process of seeing if I can 3D print these wheel's, but only if the bearing in the middle isn't bonded around the planetary gear wheel's. If they are, we'll, back to the drawing board again I'm afraid! Ian @ On Yer' Bike! M'bro