Rotor bb1 bsa steel mtb bottom bracketrotor set out with the goal of creating a bottom bracket unlike anything currently available on the market with a flashy and aesthetically appealing look the bb1 is incredibly light and is sure not to go unnoticed and the smooth unobtrusive lines marry perfectly with any type compatible crankset be it made of carbon or aluminium the bb1 is available in black colour with steel bearings enduro grade5 ceramic and enduro grade3 ceramic the steel option offer