BSA aluminium Hybrid Ceramic bearings.
We use high-grade steel rings with ceramic balls which are treated according to a special greasing and sealing procedure. The main benefit is less an extreme smoothness in operation than a longer service life and reduced maintenance. Due to the special properties of steel and ceramics this combination is however not suited to withstand severe shockloads, so we offer these bearings for our road version only.
To install this bottom bracket, the THM socket wrench is needed.