Moving the rear caliper isn't required to track the Aprilia RS660, but it does make changing the rear wheel a bit nicer.
3.5 x 0.6mm fasteners allow you to bolt to the axle bolt and create a captive hanger for a no-fuss wheel change at the track. Stock wheel speed sensor moved to the bottom under that axle and protected with a small lip to keep it safe from any wondering brake discs.
Works with or without ABS. It does not work with stock brake lines.
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