Alloy steel star nut for anchoring headset preload in 1-1/8" (28.6 mm) fork steerers Key benefits Secure headset compression: anchors the top cap and bolt so you can set and maintain correct headset preload. Durable, lightweight construction: made from alloy steel to resist deformation and withstand repeated installation and removal. Wide compatibility: designed for bicycle fork steerers with a 28.6 mm (1-1/8") inner diameter, suitable for most traditional straight steerer road and mountain bikes. Easy to install and carry: compact design that simplifies repairs and upgrades on the trail or at home. What it does Functions as the internal anchor for the headset preload system, holding the top-cap bolt under tension to eliminate play and ensure smooth steering. Provides a reliable, low-profile connection point inside the steerer tube without adding external hardware. Specifications Material: alloy steel Fit: 28.6 mm (1-1/8") fork steerer Application: front fork steerer anchoring the headset compression Practical use scenarios Replace a worn or damaged star nut when your headset develops play after impacts or long-term use. Install during headset or fork upgrades to ensure proper preload and reliable steering performance on road or trail. Carry as a compact spare for on-the-road repairs before group rides, races, or long-distance tours. Who it’s for Cyclists upgrading or repairing their headsets, bike mechanics, and enthusiasts who need a dependable, deformation-resistant internal anchor for standard 1-1/8" steerers. Simple, reliable, and compatible with standard road and mountain bike steerers — an essential component for proper headset setup and maintenance.