Don't get caught on your next Mountain Ride without a Spare TubeThe Prozio two pack of tubes easily fits in most seat bags or jersey pockets and there will still be room for a patch kit and tire levers.
Have you ever had two flats in a ride? An extra spare is always a good thing.
These Tubes will fit 26x1.9-26x2.0-26x2.1-26x2.125-26x2.25-26x2.35 bike tires.
Presta Valve LengthA 32mm valve stem works fine with most rim depths and 32mm is the most common length of valve stems.. If you have deep section rims or very deep section you will need a longer valve length. 48mm and 60 mm are other valve stem sizes that are available.
Using a Presta Valve in a Schrader RimPresta valves are smaller than Schrader and are not recommended for use in a rim that is drilled out for Schrader. There is an adapter available that will let you uses a Presta in a Schrader hole.
How Presta Valves WorkThere is no spring in a Presta Valve so the valve is kept closed by the air pressure in the tube and the little nut on the end of the valve. To add air to the tube you must first unscrew the little nut on the end of the valve. I always tap the valve and let a little air out of the tube to clear any dust that might have gotten into the valve. When you are not in the process of adding air you will want to snug up the little Presta nut on the top of the valve. Do not overtighten this, you only need to snug it up.
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