Description

Eleven Pair of Presta Valve Extensions 42mm for Deep-Section Rims

olve the issue of short valves on your deep-section rims with the Eleven pair of 42mm valve extensions—now on special offer for just €9.90 instead of €12.80. Crafted from lightweight and highly durable anodized aluminum, these extensions are designed for Presta valves with a removable valve core. They guarantee a perfect, airtight seal with zero pressure loss, allowing you to inflate your tubeless tires or inner tubes in total safety on aerodynamic carbon or alloy wheels.

• Length: 42 mm (ideal for mid to deep-section rims)

• Compatibility: Presta (French/Italian) valves with removable valve cores

• Material: Premium CNC-machined aluminum, lightweight and rustproof

• Airtight Seal: Equipped with a rubber O-ring gasket to prevent micro-leaks

• Package Content: Sold as a pair (2 pieces) with a core removal tool included

📖 DETAILED DESCRIPTION

If you have chosen the responsiveness and aerodynamics of a deep-section wheelset (whether for road, time trial, or gravel), the Eleven 42mm valve extension pair is an indispensable accessory to keep in your saddle bag or mount directly on your wheels.

Professional Removable Core Design

Unlike cheap "push-on" extensions that simply thread over an open valve (which often causes slow leaks and makes it impossible to check the pressure accurately), the Eleven system relies on removing the original valve core. The extension screws directly onto the exposed valve stem, and the removed core is then threaded into the top of the extension. This professional mechanism keeps the actual valve working at the very top, letting you check tire pressure precisely and inject tubeless sealant with ease.

Maximum Reliability and Zero Air Loss

Thanks to high-precision CNC machining and the integration of an internal rubber O-ring gasket, Eleven extensions deliver a completely airtight seal. You will no longer have to worry about annoying pressure drops during your rides or while the bike is stored in your garage.

Lightweight and Minimalist Style

The anodized black finish not only protects the aluminum against weather and corrosion, but it also blends discreetly and elegantly onto any carbon rim, keeping your bicycle's look clean and professional.

📊 TECHNICAL SPECIFICATIONS TABLE

🛠️ QUICK INSTALLATION GUIDE

Installation is straightforward and takes less than two minutes using the included tool:

1. Deflate the tire/inner tube completely.

2. Use the included black key to unscrew the original Presta valve core counter-clockwise.

3. Thread the Eleven 42mm extension onto the remaining exposed valve stem, ensuring the inner O-ring gasket is properly positioned. Tighten firmly (do not over-torque to avoid damaging the thread).

4. Thread the previously removed valve core into the top of the Eleven extension.

5. Inflate to your target pressure and close the valve as usual.

❓ FREQUENTLY ASKED QUESTIONS (FAQ)

Q: Which rim depths can I use this 42mm extension on?

A: This depends on the starting valve length of your inner tube or tubeless valve (typically 40mm or 48mm). By adding the 42mm extension, you will get a total length of approximately 80-90mm, which is perfect for aerodynamic rims with depths ranging from 45mm to 65mm.

Q: Can I use these on standard inner tubes?

A: Yes, provided that the inner tube features a Presta valve with a removable core. If the valve core cannot be unscrewed, this type of professional extension cannot be used.

Q: Will tubeless sealant clog the extension?

A: No, because the actual valve core is relocated to the top of the extension. Sealant injection and airflow function exactly as they would on a standard valve, minimizing the risk of clogging.