1 inch Threaded (Old School size)- For Old School BMX bikes- Size: 32.7mm x 26.4mm- Suits: 1" Threaded Forks x 24 TPI- Bearing Cup Diamter: 32.7mm (these are the parts that press into the headtube)- Crown Race Size: 26.4mm (this is the part that installs on to the fork)- Upper Stack Height: 23.9mm- Stack height 34.4mm- Weight: 177g- Made in Japan- Color: Chrome Silver (as pic. shown)