0.625” Remote Centre Valve Master Cylinder Our specially selected range of products that work in unison with all of our obp Motorsport core hardware. Whether you are looking for master cylinders, bias adjusters or replacement parts. obp Motorsport has you covered. Product Information: Master Cylinder Bore Size: 0.625” Inlet Fitting: 7/16”-20 UNF Outlet Fitting: 3/8”-24 UNF Push Rod Thread: 5/16” UNF Standard Master Cylinder Sizes: Front Brakes: 0.625 Rear Brakes: 0.7 Clutch: 0.75