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19 mm for dual disk bikes.
Street version is to be used with a separated reservoir (Braking does not sell - O.E.M. is recommended) and comes with the brake light switch and an optional bracket for rear mirror fitment.
The goal of the radial master cylinder versus the stock axial master cylinder (radial versus axial is the direction of the piston's movement) is that you obtain the same or more braking power by using less force on the lever.