The Spanish BB for BMX cranks with 19mm axle diameter is compatible with all frames with press-fit Spanish BB like O1 Spark, NS Majesty Park or NS Capital. Big durable Spanish bb sealed bearings are pressed directly into the frame.
-compatible with 19mm crank axles (3/4inch ID /19.05mm ID)
-two big & strong Spanish BB sealed bearings #6904 (19.05 x 37 x 9)
-compatible with all frames with 68mm Spanish BB