Aluminum alloy BMX headset * Model: Neco H671 (custom spec'd for old school BMX) * Color: PURPLE ANODIZED (true anodizing - NOT paint) * This headset fits 1" threaded forks. * 32.5mm diameter bearing cups (where they press into the headtube) * Threading is 1" X 24TPI. * Both 26.4mm and 27.0mm crown races included. * Stack height 41mm (+/- 0.5mm) * Cartridge bearings * Porkchop BMX had these custom made specifically to fit old school BMX bicycles. * Not gyro compatible. * NOTE: This headset will NOT fit road bikes, Mini's, or Landrace cruisers.