Chrome BMX headset - 1" threaded - this is the hard to find 32.7mm cups used on old school BMX and Schwinns from the 1970's and 1980's. * Manufacturer: Tange Seiki * Model: MX-2 * Material: Chromoly Steel * Finish: CHROME * Size: For 1" threaded forks, 21.1mm stem * Diameter: 32.7mm bearing cups * Stack height: 28.2+11.1=39.3mm * 26.4mm crown race * This is for standard BMX frames - NOT ROAD BIKES. Measure the inner diameter of your headtube before ordering - it should measure around 32.5mm. If it measures around 30mm, you need a ISO or JIS road bike headset, not this one. * Gyro compatible * MADE IN JAPAN This headset comes with a 26.4mm fork crown race. Some forks use a 27.0mm crown race.