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Tools & Maintenance Scales & Measurement Devices

Park Tool DCA-1 Digital Caliper Accessory

Disc brake rotors should be regularly checked for wear to ensure safety and performance. 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 center of the braking surface, bypassing the unworn edge to ensure an accurate measurement. The conical end points of the DCA-1 can be used to measure center-to-center distances of bolt holes for calculating bolt circle diameter (BCD) of chainrings and cranks


  • Composite fittings that attach to calipers for regularly checking brake rotors for wear
  • Can help assure rotor wear is ideal for safety and performance
  • Compatible with most standard Vernier, dial, and digital caliper designs
  • Special contact points bypass the unworn outer edge of a rotor so you get accurate measurement of worn surface
  • Conical ends allow for easy measurement of BCD and spoke hole diameters in hub flanges for spoke measuring process
  • Inset hex screws allow you install the pieces on calipers quickly and securely
  • Sold as a pair
  • Color: Clear