Mountain Bike Headset Set - 1-1/8 Threadless, Aluminium Alloy, 42x52mm, For City Commuter & Folding Bikes

This is a replacement headset for your bike—the set of bearings that let your fork turn smoothly inside the frame.

It's a 1-1/8 inch threadless headset, which is super common on modern mountain bikes, hybrid bikes, commuter bikes, and folding bikes.

It's made from aluminum alloy, so it's lightweight and durable with a black anodized finish.

The specifications are 28.6mm for the steerer tube (that's the part of the fork that goes through the frame), and the cups fit into a frame with an upper inner diameter of 42mm and a lower inner diameter of 52mm.

The lower stack height is 39.8mm (for a tapered fork) or 30mm (for a straight fork).

It includes both the upper and lower cups, bearings, seals, and any necessary spacers—basically everything you need for a headset replacement.

The bearings are sealed cartridge bearings, which are low maintenance and protect against dirt and water.

Installation requires some bike mechanic skills and tools to press the cups into the frame properly.

If your old headset is creaking, feels rough, or is worn out, this is a solid, affordable replacement to get your steering smooth again.

Just make sure these measurements match your bike's frame and fork before buying.