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How to determine a piston dia.

 

Piston Size & Identification

Size is dictated by piston diameter — not by seal or boot measurement

Internal Dust Boot Fitment
38 × 32
38mm diameter · 32mm height
External Dust Boot Fitment
38 × 27.5
38mm diameter · 27.5mm height
âš  All seal and boot sizes are dictated by the piston diameter — not by seal or boot measurement.
Not sure of your piston size? See how to measure it without removing the caliper →

 

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