Stronglight Raz - In  ( 252777 )     ( 44 mm / 50 mm )      1-1/8" / 1-1/2"  Semi - Integrated Headset...

Upper Cup Insert dia.  44 mm   /  Lower Cup Insert dia. 50 mm

Upper bearing size    41 / 30.15 mm 

Lower bearing size        

Top Cap height - Approx. 7.5 mm..

Crown race seating inside diameter - 40 mm

Stack height -