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.