A VP threaded headset for 21.1 mm BMX steerers, 21.1 x 30.0 x 27.0 mm, in black or chrome. A threaded headset screws onto a threaded fork steerer and is locked with a nut. It's the older standard, still used on many BMX, kids' and classic bikes.

• Threaded, 21.1 mm
• For BMX
• Black or chrome plated

The headset is the bearing set that lets the fork and bars turn smoothly in the frame. A worn or loose headset shows up as a knock under braking or steering that feels notchy. This listing groups the finishes; choose colour (black or chrome) below.

Headsets are frame-specific, so check the steerer size and every figure against your frame and fork before ordering. The dimensions are published exactly as the supplier lists them: 21.1 x 30.0 x 27.0 mm. The supplier doesn't give an SHIS code, so we haven't listed one. Fitting needs a headset press and a crown race tool.

Grease the bearing seats and the crown race before fitting, and set the preload so the fork turns freely with no play when you rock the bike with the front brake on.

Not sure it fits your bike? Send us the make, model and year before ordering and we'll confirm.