Bontrager Presta Valve Extenders

No, you do not need to replace your tubes, but you must ensure your current inner tubes have removable valve cores. These extenders are specifically designed to thread directly onto the valve stem once the core is removed.

The size you choose depends on the depth of your wheel rim. You need an extender long enough to clear the rim profile so your pump head can securely attach to the valve. Measure the depth of your rim and add roughly 15-20mm to ensure the pump head has enough clearance to operate comfortably.

These are compatible with Presta valves, but only those with removable cores. If your valve core is fixed and cannot be unscrewed, these extenders will not work with your setup.

Once installed, these extenders essentially become a permanent part of your valve stem. You can inflate and deflate your tires just as you would with a standard valve, though you will need to keep the valve core tightened properly at the top of the extender.

Brass is used for its durability and ability to create a reliable, airtight seal when threaded. It is a robust material that withstands the repeated stress of attaching and removing pump heads without stripping or deforming.