VeloTubes Presta Valve Core - 10 Pack

Product Information

Schrader valves are too wide for some tires and rims- Some racing rims and tires are too narrow for Schrader valves to fit. The valve would rub against the beads of the tire. In this case, you won’t be able to use Schrader valves. Presta valves may hold more air pressure- Road bike tires need to be inflated to 90-125 psi. Presta valvs can handle these pressures without any issues. Schrader valves may not be able to handle as much pressure. Even though the pressure rating may be lower, many cyclists run Schrader valves at high pressures without issue. Schrader valves are also used in many high pressure application. For example, airplane tires use Schrader valves and are frequently inflated to over 200 psi. Look at virtually every other pneumatic thing that requires air inflation: cars, airplanes, plumbing, even Dakar rally suspension, they all use Schrader valves. If Presta was the superior valve to be used, other industries would use them.

Unless you're racing in the National Hill Climbing championships, you're likely to only need standard tubes, often made from butyl rubber. This is what the majority of inner tubes are made from because it's not only the cheapest, but it's the most robust. If you want a tube you can repair with a puncture kit, then standard butyl rubber will do. For flat prevention, sealant needs to be installed in your tubeless tires. Chances are, that if you run tubeless, you've probably formulated a love hate relationship with sealant. It can be a life saver when small punctures happen but it can also be a bit of a nuisance to install. First off it's messy, and can get on everything if not dealt with properly. It also dries up, needs replacing, and can clog and potentially seal things you don't want sealed, like your valve core. Note: Refer to the sealant manufacturer's guidelines in regards to the amount of sealant to install. Different tire sizes and applications will require differing amounts. The Sclaverand valve was invented by Frenchman Etienne Sclaverand and is often referred to as the French valve. Today it is also known as Presta valve. [1] [2] Presta or presto stands in the Romance languages for "fast, hurry, immediately". [3] Description [ edit ] The rim hole drilled for the Presta valve is narrow than the hole of the Schrader valve. Therefore, you will need to enlarge this hole to install the Schrader valve, but this method destroys the rim design.But if that is the case, and unless these screws are manufactured to incredible tolerances (they don't seem to be), then loctite would not be optional. Another advantage of removable inner cores is that you can replace a broken valve instead of replacing the whole tube, which could save you some money. Since the valve core is somewhat fragile, it is a possibility. It doesn’t save much on cheap tubes, but some can cost up to 150 dollars. Tubeless Presta valves Presta valves are the universal standard on most bicycles, whereas Schrader valves are the standard on cars, motorcycles, and almost all other vehicles with tyres. Is there any value in swapping from one to the other? The only way to make Schrader valves fit in Presta drilled rims is to drill the valve hole out so it’s wider. This is not recommended because it can compromise the structural integrity of the rim. Particularly if you’re running carbon fiber rims or narrow road bike rims. A Note About Valve Adapters No. All tubeless rims use the smaller valve hole that only works with Presta. Do all valves fit all rim shapes?

Presta tubes also come with a plastic cap. I tend to keep this on to protect the valve. How do I deflate a tube with a Presta valve? The size of the stem hole is significant as it significantly reduces the strength of narrow cross-sections. Therefore, these valves are best suitable for tires that have narrow rim holes. In a narrow rim (e.g., clincher tire), there is not enough space to install a large Schrader valve between the beads of the tire.

Presta valves are a narrow and skinny type of bike tube valve that is used to hold high amounts of air inside bicycle tires. The air pressure in an inflated tire holds the inner valve body shut. A small screw and captive nut on the top of the valve body permits the valve to be screwed shut and ensure that it remains tightly closed. It happens with pump heads that screw on (like Lezyne), and it’s a severe let down to think you’re almost finished up fixing a flat only to have all the air you just pumped in come rushing out as you pull off the pump. 7. Schrader drilled rims can use either valve

They’re slide slotted to work with inserts but still have a straight through hole for fast filling if you’ve not put an insert in the way. Another nice touch is that one of the valve caps works as a mini wrench for undoing the valve core (for faster inflation/sealant filling) and the other one is a spoke tensioning key. Oh and the rubber rim plug sections are replaceable too. The following sizes are common for mountain bike tyres, regardless of whether your bike has 26in, 27.5in (650b) or 29in wheels.

What is a Schrader valve?

The stem hole is the weakest part of a cycle rim. The small holes in the Presta valve reduce the wheel diameter and also maintain adequate wheel strength. Whereas Schrader valves cover their valve core with a layer of threaded plastic, Presta valves are less likely to get damaged or worn by crashes, weather, or normal wear and tear. On the other hand, if you want to install Presta valves in the Schrader rim holes, reducers or washers may be needed to cover the additional area. The wheels are stronger when you use Prest valves- The valve hole creates a weak spot in the rim. Because Presta valves are more narrow than Schrader valves, the valve hole is smaller. The smaller valve hole leaves an extra couple of millimeters of material in the rim. This extra material helps to maintain wheel strength. In other words, Presta valves affect the structural integrity of the rim less than Schrader valves. This doesn’t make much of a difference for wide mountain bike rims. For narrow road rims, having smaller valve holes can help to make the wheel much stronger. A stronger wheel is more durable. It will also stay true longer. If your rim accepts tires less than 28mm, you should use Presta valves. Some of the presta tires have removable valve core and some don’t, which you can recognize by the two flat sides on the top part of the valve. If you don’t find those flats on the top the core is non-removable.

The bicycle valve and pump can humble any rider. What is seemingly simple can become desperately challenging, especially when the sealant is clogging cores or a valve head is bent, with air hissing instead of inflating. Even worse is having pump attachments stubbornly refusing to interact with the intended valve interface, because you’ve tried to match the wrong standards. Presta valves are mostly used on narrow racing bike tires because of their small width and the need for tight holes in the rim. The valve hole is the weakest unit of the rim.

You can inflate Dunlop valves with a Presta compatible pump. One nice thing about these valves is that you can remove and replace the valve cores without any special tools.They can also be placed in rims drilled for Schrader valves without any modification. There is a third type of valve that is much less common than Presta or Schrader. This is the Dunlop or Woods valve.