Nitto MTC Quill Adapter

This adapter is designed for standard 1-inch threaded steerers, which are common on most vintage road and touring bikes. It converts your 22.2mm quill interface to accept a modern 1-1/8 inch threadless stem.

The length you choose depends on your desired handlebar height. The 130mm version is best for a lower, more aggressive position, while the 190mm and 225mm options provide more flexibility for raising your bars for a more upright, comfortable ride.

Yes, the knurled upper section is a critical design feature. It provides extra friction to ensure your threadless stem clamps securely to the adapter without slipping, which is essential for safe handling.

The maximum height line indicates the limit of how far you can safely extend the adapter from the steerer tube. Extending it beyond this mark compromises the structural integrity of the component and creates a significant safety risk.

This adapter is compatible with standard 1-1/8 inch threadless stems. However, always ensure your chosen stem is properly tightened to the manufacturer's torque specifications to prevent movement.