Many reasons for doing it, looks, braking power, etc. I don't think duals are really needed on the street, if you want a little more oomph Steve Lenac's 6-piston bracket/caliper and a EBC Pro-Lite is more than enough. On the track, however, sometimes single discs don't cut it, they heat too much and fade, particularly if the Hawk/rider in question is a fast one.
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