- The DCA-1 installs onto most digital, dial, or vernier calipers (including the Park Tool DC-1) and features protruding contact points that allow measurement of the centre of the braking surface, bypassing the unworn edge to ensure an accurate measurement
- The conical end points of the DCA-1 can also be used to measure centre-to-centre distances of bolt holes for calculating bolt circle diameter (BCD) of chainrings and cranks
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