How to measure a piston

How to figure out a piston diameter without removing it from the caliper.

Please note this method is for your convenience & general guideline only, we can't guarantee its accuracy, due to the variation of original  piston construction, until you "pop out" the pistons out of caliper and actually measure it.

  1. Measure the flange diameter eg. 35mm
  2. Add 3mm to the measurement, you get 38mm for the piston diameter.



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