How Does A Presta Bike Valve Work
The valve on it is not one of those you mention above and the adaptor you can buy to allow you to pump up a presta using a schrader attachment does not fit.
How does a presta bike valve work. This video shows the steps necessary to inflate a bicycle tire with a presta valve. These can be purchased for about a dollar at your local bike shop. The thicker schrader valve might not fit into a rim drilled precisely for the thinner presta valve. The presta valve is on the left.
The presta valve also called french valve fv or sclaverand valve is a valve commonly found in high pressure road style and some mountain bicycle inner tubes it comprises an outer valve stem and an inner valve body. The rim hole for schrader valves is bigger than the hole for presta valves. If you have a presta valve in a schrader hole use a rubber ring grommet in the hole available at bike shops to keep the presta valve from sliding around and damaging the tube or the valve itself. The outer wall is threaded to accept a cap or pump head.
Georgena terry explains presta valves and gives some tips about pumps. Hi i have inherited a ladies bicycle called an esperia. Presta valves are a lot narrower and are commonly found on higher end bikes with narrow rims. Presta valves will fit any bike rim.
The outer valve stem is manufactured in various lengths for different applications and has a. They tend to hold air better than schrader valves. Since presta valves are thinner they should fit onto any bike rim. The bicycle shop showed me how to use the adapters and told me to leave them on the valve stems so that i would always have the adapters with me if i needed them.
They are a little trickier to inflate as they use a manual locknut to open the valve for inflation. Schrader valves might not. Some people drill larger holes in their rims to be able to accept both. Since the stem on the presta is a lot narrower it allows for manufacturers to make narrower wheels and tires.
The stem on the valve is quite long and thin and has a silver piece at the top which screws right the way off. A lock nut to secure the stem at the wheel rim and a valve cap may also be present. This is typically found in bicycle tubes on many road bikes and some mountain bikes. Road bikes 90 100 psi hybrid bikes 65 80 psi mtb 30 50 psi.
I can t address the issue of the length of your valve stem but i was lucky enough to have my bike shop include a pair of presta to schraeder adapters when i bought the bike.
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