Threadless Stem Conversion Adapter for Vintage Bikes

Upgrade your classic threaded fork to modern threadless stems effortlessly with this precision-engineered conversion adapter. Perfect for cyclists restoring vintage road bikes or customizing retro builds, this adapter bridges the gap between old-school forks and contemporary handlebar setups.

Key Features:

• Dual Compatibility: Fits both 1″ (22.2mm quill) and 1-1/8″ (25.4mm quill) stems, with steerer clamp options for 25.4mm (1″) or 28.6mm (1-1/8″) forks.
• Adjustable Rise: Achieve up to 25mm of additional handlebar height when paired with spacers—ideal for ergonomic tuning.
• Sleek Finish: Polished silver design blends seamlessly with chrome or alloy components.
• Secure Fit: Generous 41mm clamp length ensures stability during rides.

Why Choose This Adapter?

Unlike generic adapters, this model offers precise machining for vibration-free performance, making it a favorite among bike mechanics and DIY enthusiasts. Its versatility suits everything from urban commuters to gravel bike conversions.

Pro Tip: Pair with a high-rise threadless stem for a comfortable, upright riding position on classic frames.

Specs:
| Feature | Measurement |
|———————–|———————-|
| Quill Insertion | 22.2mm (1″) / 25.4mm (1-1/8″) |
| Steerer Clamp OD | 25.4mm or 28.6mm |
| Max Rise Increase | 25mm (with spacers) |