Listed is a 3D printed replacement optical sensor wheel for Logitech G27. It has 30 slots designed for the G27 only. (Not compatible with G25)
Replacement instructions can be found on ifixit
This is not an official part and it is only intended for DIY use.
Outer Diameter (OD): 16mm
Shaft Diameter: 3.12 mm
Hight (H): 6.42 mm
(All measurements within 0.2mm error)
Use this replacement part at your own risk, I take no responsibility for any damage caused to your device by usage or installation of this part.