Radial clutch master cylinder from the RCS (Ratio Click System) series, designed to improve the feel and modulation of the clutch control on sports bikes. This specific model is the 19RCS, characterized by a piston with a diameter of 19 mm.
RCS System (Ratio Click System): Allows you to adjust the lever's distance in two positions:
18 mm: For a more modulable and softer clutch.
20 mm: For a quicker and more aggressive response.
Construction: Forged aluminum alloy pump body, finished with CNC machines and hard oxidation treatment for greater wear resistance.
Jointed Lever: Designed to fold in case of a fall, reducing the risk of breaking the pump body.
Compatibility: Usable only with DOT 4 brake fluid (not compatible with mineral oil).
Although it is a universal component suitable for standard 22.2 mm (7/8") handlebars, it is commonly used as an upgrade for Ducati, Aprilia, KTM, and various Japanese bikes with hydraulic clutch control.
Note: For installation on some Japanese bikes, a hydraulic adapter (banjo) M10x1.0 mm may be required, as many original configurations use different pitches (M10x1.25 mm).