This cutting facer is used on the HTR-1, HTR-1B, BFS-1 and BTS-1. It has an outside diameter of approximately 45mm.
NOTE: Always use a cutting fluid such as Park Tool CF-2 when machining.
SHIS terminology: The 690 faces headtubes in the EC29, EC30, EC34 and EC37 standards
Manufacturer's Part Number: 690