Bike Headset Expander Star Nut Top Cap 1-1/8" Fork 22-25mm
Bike Headset Expander Star Nut Top Cap 1-1/8" Fork 22-25mm
Bicycle Headset Expander Star Nut & Top Cap Bolt – 1-1/8" Fork (22–25mm)
Keep your front fork headset perfectly secure with this precision-machined Bicycle Headset Expander Star Nut Plug Bolt from RideRace. Engineered for 1-1/8" threadless forks with an expansion range of 21.5–24mm, this top cap stem bolt provides a reliable, rattle-free fit for road bikes, mountain bikes, and commuters alike.
Key Features
- Material: CNC-machined aluminum alloy body with a stainless steel screw for lasting durability and corrosion resistance
- Compatibility: Fits 1-1/8" (22–25mm) threadless front forks
- Expansion Range: 21.5–24mm for a secure, snug fit inside the steerer tube
- Height: 52mm for optimal stem clamping depth
- Lightweight: Only ~58g (0.06 kg) — won't add unnecessary weight to your setup
- CNC Knurling & Heat Treatment: Enhanced grip and long-term strength under riding conditions
- Model: RR9394 by RideRace
Specifications
| Brand | RideRace |
| Model | RR9394 |
| Material | Aluminum Alloy + Stainless Steel Screw |
| Height | 52mm |
| Expansion Range | 21.5–24mm |
| Fork Size | 1-1/8" (22–25mm) |
| Weight | ~58g |
| Process | CNC Knurling, Heat Treatment |
| Country of Origin | Made in China |
What's Included
- 1 × Bicycle Headset Expander Star Nut Top Cap Bolt (RR9394)
Please Note
- Colors may vary slightly due to monitor settings and lighting conditions.
- Please allow 1–2mm measurement deviation due to manual measurement.
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Frequently Asked Questions
Q: What fork sizes does this bicycle headset expander star nut fit?
A: This headset expander star nut is designed for 1-1/8" (28.6mm outer diameter) threadless front forks with an inner diameter between 21.5mm and 24mm, making it compatible with the most common fork steerer tubes on road bikes, mountain bikes, and hybrid bikes.
Q: What material is the headset expander made from?
A: The expander body is CNC-machined from lightweight aluminum alloy and paired with a stainless steel bolt. The heat treatment and knurling process ensure a strong, secure grip inside the steerer tube for reliable long-term performance.
Q: Is this star nut easy to install without special tools?
A: Yes. The expanding nut design allows for straightforward installation inside the fork's steerer tube using a standard Allen/hex key. Simply insert the expander, position it at the correct depth, and tighten the stainless steel bolt to expand and lock it in place securely.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.