Lightweight and stealth black, these aluminum 40mm stems have universal bases. Comes with valve caps, stem tool, lock ring and rim protecting standoff.
- Made of anodized black aluminum.
- Universal conical valve base.
- Sold as a set of 2.
Bicycle tubes are valve-specific. Presta – narrow, with a built-in valve cap that you loosen when pumping up the tire and tighten again afterwards. Schrader – wide, with a pressure valve similar to those on a car tire.