The Rant Bang Ur Euro BB kit is designed to work with most bikes that have a Euro BB. Accepts 19mm spindles. and spec is based on the most prevalent British ISO standard- 1.37 x 24tpi with 68mm BB shell. Includes LH and RH threaded alloy cups. 4 precision sealed bearings. 2 alloy cone spacers for a clean look. an alloy internal spacer. and 4 steel crank arm spacers for dialing in your chain alignment.