For anyone interested, I was able to get a copy of the spec sheet from SiaEcosys, a subsidiary of TZ quanshun (qs motor).
From the source:
QS273 V3 40H EXTRA TYPE
74*222
48v- 970 rpm
60v- 1210 rpm
72v- 1450 rpm
68*232
830
1030
1240
58*323
730
910
1090
52*333
640
800
960
48*343
580
720
870...