Originally Posted by Pete_vB
Every modern multi-piston caliper is going to have staggered piston sizes to keep brake pad wear even. PCCBs up front are 28/ 32/ 34mm. Visually yours look similar or maybe slightly smaller? Knowing the piston sizes and rotor diameter you can make a close estimate of brake torque and brake balance- it needs to be close to stock or you'd want to change the brake proportioning to match.
No worries, I have asked the guys to measure up today before the install.