Angular contact ball bearings made of stainless steel and well thought-out seals in Acros’ BB30 Reducer Bottom Bracket ensure a long service life with minimum maintenance and thus more carefree time on the bike.High quality bearings for your bike – Ride more, worry less!Key Features CNC – made in Germany, high-strength 7075 aluminium Stainless steel angular contact ball bearings, double sealed R2 seal (rubber lip seal) Dust protection cap Weight: 99g Compatibility: Hollowtech II Shell inside : 42mm Shell width: 68/73mm