Now .. I measured by myself:
front sprocket:
it is out of stock (serial Version): 13t (as mentioned in the manual)
inner diameter 17,0 mm (i agree with yours)
next diameter 20 mm (i agree with yours)
distance hole to hole 34 mm (I agree with yours)
thickness over all : 7 mm (I agree that doesn´t matter if 7 or 8mm)
slot : 4mm (I agree with yours)
So .. i´m astonished that you have one with 12t mounted original???
please check once more.
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