Disc brake rotor
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Updated:
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I extracted this information from Steve Odell on the old Yahoo! Loopframe_Guzzi news group (which has now moved to Groups.io). In Steve's own words:
Minimum thickness is stated by Brembo to be 5.7 mm.
Disc brake rotor.
Photo courtesy of Steve Odell.
Disc brake rotor.
Photo courtesy of Steve Odell.
Disc brake rotor.
Photo courtesy of Steve Odell.
Disc brake rotor.
Photo courtesy of Steve Odell.
Disc brake rotor.
Photo courtesy of Steve Odell.