The Park Tool DCA-1 caliper adapter turns a standard caliper into a dedicated tool for two key workshop checks: the remaining thickness of disc brake rotors and the BCD, the bolt circle diameter of chainrings and cranks. It installs on most digital, dial or vernier calipers.
The DCA-1 works with two types of tips. The protruding contact points measure the centre of the rotor braking surface, avoiding the unworn outer edge that would distort the reading. The conical tips sit in the bolt holes and measure the centre-to-centre distance, the value used to calculate the BCD of chainrings and cranks.
Where to use the DCA-1 caliper adapter
- Rotor wear check: measures thickness where the pads actually work, for a more accurate reading.
- BCD measurement: measures the distance between bolt holes to calculate the bolt circle diameter of chainrings and cranks.
- Scheduled maintenance: rotors should be checked regularly to ensure braking safety and performance.
- Choosing spare parts: knowing the exact BCD helps you find the right chainring for the crankset.
Why choose Park Tool DCA-1
- Fits most digital, dial and vernier calipers.
- Compatible with Park Tool DC-1, DC-2 and DC-3 digital calipers.
- One accessory for two key measurements: rotor wear and BCD.
- Protruding tips designed to skip the unworn edge of the rotor.
If you already have a caliper on the bench, the Park Tool DCA-1 caliper adapter is the simplest way to make disc brake and drivetrain checks more precise.
TECHNICAL SPECIFICATIONS
General
- Code: DCA-1
- Brand: Park Tool
- Functions: disc rotor wear measurement, chainring and crank BCD measurement
Compatibility
- Calipers: most digital, dial and vernier calipers
- Park Tool calipers: DC-1, DC-2, DC-3
The Park Tool DCA-1 caliper adapter turns a standard caliper into a dedicated tool for two key workshop checks: the remaining thickness of disc brake rotors and the BCD, the bolt circle diameter of chainrings and cranks. It installs on most digital, dial or vernier calipers.
The DCA-1 works with two types of tips. The protruding contact points measure the centre of the rotor braking surface, avoiding the unworn outer edge that would distort the reading. The conical tips sit in the bolt holes and measure the centre-to-centre distance, the value used to calculate the BCD of chainrings and cranks.
Where to use the DCA-1 caliper adapter
- Rotor wear check: measures thickness where the pads actually work, for a more accurate reading.
- BCD measurement: measures the distance between bolt holes to calculate the bolt circle diameter of chainrings and cranks.
- Scheduled maintenance: rotors should be checked regularly to ensure braking safety and performance.
- Choosing spare parts: knowing the exact BCD helps you find the right chainring for the crankset.
Why choose Park Tool DCA-1
- Fits most digital, dial and vernier calipers.
- Compatible with Park Tool DC-1, DC-2 and DC-3 digital calipers.
- One accessory for two key measurements: rotor wear and BCD.
- Protruding tips designed to skip the unworn edge of the rotor.
If you already have a caliper on the bench, the Park Tool DCA-1 caliper adapter is the simplest way to make disc brake and drivetrain checks more precise.
TECHNICAL SPECIFICATIONS
General
- Code: DCA-1
- Brand: Park Tool
- Functions: disc rotor wear measurement, chainring and crank BCD measurement
Compatibility
- Calipers: most digital, dial and vernier calipers
- Park Tool calipers: DC-1, DC-2, DC-3
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