Full Speed Ahead Headset Spacers

These spacers are designed for standard 1-1/8 inch threadless steerer tubes, which is the most common size for modern road and mountain bikes. If your bike uses a tapered or straight 1-1/8 inch steerer, these will fit perfectly.

Polycarbonate is significantly lighter than aluminum, which helps keep the front end of your bike agile. Additionally, the material is completely corrosion-resistant, meaning it won't seize or oxidize against your stem or headset over time.

Yes, with ten 10mm spacers included, you have a total of 100mm of adjustment range. This is more than enough to fine-tune your cockpit ergonomics or experiment with your riding position during a bike fit.

No special tools are required. You simply need to loosen your stem bolts, slide the spacers onto the steerer tube to your desired height, and re-tighten the stem according to your manufacturer's torque specifications.

While polycarbonate is durable and impact-resistant, it is primarily designed for static adjustment of the stem. They are perfectly suitable for road, gravel, and cross-country riding, but we recommend checking your headset preload periodically as you would with any spacer material.