Q-tubes are great reliable replacement tubes that come in a variety of sizes for most applications from the smallest kids bike to world class race bikes.
Presta valve tube have an external thread and are thinner that standard Schrader valve tubes. An adaptor can be fitted onto this
external thread to permit the Presta valve to be connected to a pump
with a Schrader head.
If you are going to use Presta tubes in a rim that is designed for Schrader tubes you must use an adapter such as the Wheels Manufacturing Presta Saver to prevent damage to the valve stem.
Presta tubes work better in high pressure tires because the valve has no return spring which pushes the valve closed under pressure. You close the valve by turning the valve core shut.
Specifications
ISO Diameter
622
Labeled Size
700x23-25
Material
Butyl
Tube Style
Standard
Valve Core
Removable
Valve Length
Long 56 - 74 mm
Valve Shaft
Threaded
Valve Shaft Type
Threaded
Valve Type
Presta, Presta Long 56-74mm
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Customer Questions
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asked by: a guest is this valve/stem length long enough to fit into a Zipp 404 clincher?
A.
anwered by: gfontana The stem length for a Zipp 404 has to be > 58mm. These are 60mm, so you'd only have 2mm showing. I wouldn't imagine that would work and/or look very good.
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