Assertion: cog's teeth | /r/HasProperty | the default option
Facets:
value: in practice
type: TEMPORAL
Source sentences:
text: a PCD of 135mm allows small chain ring options down to 39 teeth and while a 130mm PCD will allow an inner chain ring size of 38 teeth, in practice 39 teeth is the default option and is usually paired with a 53 tooth or occasionally, 52 tooth outer chain ring.