This is the one single brake disc. If you plan to change discs on the entire axle then you should buy two products.
Dimensions and size
Brake Disc Thickness
23
mm
Centering Diameter
67
mm
Height
48
mm
Minimum thickness
21.5
mm
Outer Diameter
315
mm
The Zimmermann® Black Z™ brake disc was developed with the experience of standard brake discs combined with the expertise of using them on the race track. The unique design of the grooves is patent protected. The exceptional brake performance with faster response and optimum heat dissipation meets the high demands of racing and can now also be experienced in road operation.