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Presta-2TM 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-2TM 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?
Why Buy Presta-2TM valves?
Presta-2TM 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-2TM 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-2TM valve allows the valve extender to be taken off the wheel after inflation.
Can I buy a Presta-2TM 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-2TM 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.
Copyright 2012 Presta-2. All rights reserved.
ph: 650-400-5531
service