Dual Piston Front Brake Caliper Piston Diameter

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blooot

Member
Joined
May 14, 2021
Messages
13
Location
San Francisco
If anyone has a dual piston front brake caliper handy, I'd love to know the piston diameter. Putting together a big brake setup and am trying to size the replacement calipers.

Thanks!
 
I little more digging and I found it on a part store website -- for future posterity it's 30.5mm. <-WRONG

I have an early build 2013, with the dual pistons, and oddly it shows the late ZE0 single piston caliper having the same diameter... is the master cylinder half the area on the later ZE0s? The brake master cylinder is a different part number.

LATE EDIT, I had the wrong info and it's a 45mm dual piston.
 

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