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Presta-2^TM is a patent pending valve design that offers both aero-advantage and inertial advantage to the serious racer. 93% of aero drag and power loss occurs within 3 inches of a 700c rim because wheels spin faster at the rim than the center of the wheel. That is exactly the wrong place to have a large chunk of brass sticking out of your wheel! The design of the Presta-2^TM hides the valve fully inside of the rim. This is the equivalent of dropping two areo spokes from a wheel. How would you like to be able to remove the equivalent of two more spokes from your wheel?

What are Presta-2^TM valves?
Presta-2^TM valves are a patent pending design with the actuatable portion of the valve longer than the overall length of the valve body. This allows for a presta style valve that is short enough to hide inside a standard depth double wall bicycle wheel. The valves are machined and hand assembled in the U.S.A.

Why spend $45 on a valve?
Presta-2^TM valves are the only “hidden” valves on the market and they are machined and hand assembled in the U.S.A. They provide real world aerodynamic and inertial racing advantage and we employ actual Americans to make Presta-2^TM valves. The valves come installed on Michelin Ultra Light inner tubes.

How can I get Presta-2^TM Valves?
Presta-2^TM valves are available only on this website or via your local bicycle dealer. They are sold in pairs for $90 installed on high Michelin Ultra Light inner tubes.

What do I use to cover the hole on my rim now that there is no valve stem sticking out?
We provide a two types of covers with each valve for the valve hole in the rim. The first cover protrudes slighty and is easy to pinch off. Use this cover if you are adjsuting air pressure often. The second cover is fully flush and takes a few more seconds to get off.

Do Presta-2^TM valves come with a warranty?
Yeah, if we screwed up in manufacture then we will swap product for product, but you pay to ship it back to us. The warranty period is 90 days. We test each valve to 160psi so we have not yet seen a return. Keep in mind the valve is warranted, not the tube. If you flat then talk to your tire company or patch the tube. Nails happen.

Why Buy Presta-2^TM valves?
Presta-2^TM valves allow you to trade 2 wheel mounted valve stems for 1 pump mounted adaptor. Deleting valve stems from your bicycle reduces aerodynamic drag and rotating mass. This savings is approximately the same as deleting two spokes from a wheel without losing any wheel strength. Translated to watts, this savings is about 3 watts for two 700c wheels at 25mph. The design of Presta-2 valves also allows for a more precisely balanced wheel and greatly reduces the chance of flats from valve stem damage by debris.

How do I inflate an inner tube with Presta-2^TM valves?
You will need to use a valve extender with a nut driver on it like Topeak model #TFV-01. You can buy one here or at your local bike shop. the valve extender is used during inflation to make a pneumatic seal with the pump and the actuate the nut on the valve. The Presta-2^TM valve allows the valve extender to be taken off the wheel after inflation.

Can I buy a Presta-2^TM Valve for my tubeless or tubular setups?
Yes, starting in April 2012. If enough people email us before then we might start shipping in March.

What rims can I use with the Presta-2^TM valve?
The minimum rim depth is 0.375 inches to hide the valve within the wheel. We will soon offer the valve for other rim sizes and as a stand alone for tubeless designs.

Presta-2 TM 2012 by Ken Hawthorn

ph: 650-400-5531
service@Presta-2.com