VeloTubes Presta Valve Core - 10 Pack

Product Information

Presta valves are a bit longer than Schrader valves. The standard Schrader valve length is 32mm. Presta valves come in a range of lengths including 32, 42, 48, and 60 mm. If you have a Schrader drilled rim and you only have a Presta valve tube at hand you can use it as the hole is wide enough to fit the valve through. It is not ideal because the wiggling in the loose hole can cause the rim to cut the tube and it is recommended change the tube for the proper one as soon as you can.

To deflate a Presta valve tube, just unscrew the valve pin and press down. The loud hissing noise scares my dog so I try not to deflate with her nearby. Can I repair a Presta valve? We've run through the differences and similarities between the Presta and Schrader valve now, so you should be able to handle this, but to recap: the Presta valve is skinny and pointed at the end, while the Schrader valve is wider, and rounded at the end. What kind of inner tube do I need? Presta valves are a narrow and skinny type of bike tube valve that is used to hold high amounts of air inside bicycle tires.If you want to inflate the tire tube, first of all, you need to unscrew the valve nut at the top. When opening the nut, don’t unscrew the entire core. In such a case, air will suddenly leak from the tire. And the last consideration is valve length — tube manufacturers could easily make longer Schrader valves. 48mm Schrader valves exist, perhaps a valve extender could be used for additional length when needed. If you drill a hole in the tire rim for a Presta valve, you cannot place a tube with a Schrader valve in your cycle rim because the Schrader valve has a large diameter, and it will not fit through the rim hole. Therefore, you will need to re-drill the wheel with a large hole to install a tube with a Schrader valve. Presta valves can fit narrower rims- Some road rims are so narrow that a Schrader valve can’t fit between the beads of the tire. This is often the case on racing bikes that use clincher tires. Presta valves are narrow enough to fit between the beads. If you use extremely narrow tires, you’ll need to use Presta 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. Presta valves are easier to inflate- When you use Presta valves, you don’t have to overcome the valve spring when using the pump. Pumping takes less effort. This makes it much easier to inflate high pressure road bike tires. Since Presta valves are made entirely from metal (rather than a Schrader valve with plastic casing), they are stronger and more resilient in all conditions. Schrader valves are more likely to be damaged in a crash, and are more likely to degrade faster than Presta valves. Despite lots of development when it comes to the best tubeless tires in mountain bike, gravel and road, the best tubeless wheels and best tubeless tire valves have hardly changed for ages. You could get different colors for matching other anodized components and you could get different lengths for different depths of rim but that was about it. 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.

Let’s start with the pros: Presta valves are lighter than Schrader valves and the hole required for the valve to fit through the rim is smaller, which improves the structural integrity of the rim. This is particularly important for narrower rims, designed for road use, and also for carbon fibre rims. Metal-against-metal does not provide a seal. For the barrier between the valve core and the valve stem to stop air, the white plastic piece must be acting as a seal, with one of three methods: Method A1 On the other hand, they’re much more fragile and more awkward to fit as they’re floppier than butyl tubes. 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.