These sit "inline" between the valve core and existing stem. Simply remove your valve core with the included tool, install the extension to your existing stem and reinstall the valve core. Compatible with any tubular tire with removable valve core. Priced per pair. Valve tool included.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.