Material: Thinvik BSA Bottom Bracket characterize cold-forged and CNC-machined aluminum alloy cups, dual-labyrinth bearing covers and precision sealed bearings. Compatibility: Designed for road bike and MTB, they are perfect match 24mm crank spindle.(Not for Sram GXP 22mm,Dub 28.99mm, FSA and other brand 30mm spindle crank) Shell width: Fit frames with 68/73mm bottom bracket shells Thread: BC1.37-inch*24T L/R Threaded Connection design enhance lateral stability to avoid creaking sound If you have any question about the product, please feel free to contact us