If you are using extender check the tightness occasionally and always before you try and pump your tires up.For the valve tool at home wrap it in a bit of electrical tape with a small tail coming off it.Make sure you keep a valve tool in your ride tool pocket and one in your kit at home.Recommend Valve length you should choose for your wheels Generally speaking,the longer the rim depth, the longer the valve size you need. Many manufacturers calculate the appropriate value length based on a large amount of test data. ![]() There is currently no standard for the length of the long valve tube, but most of them are around 50-80 mm. It also means if the worst does happen you can phone round bike shops or order valves on the internet knowing that they will be the ones that you need. We would recommend that you always have spares of the correct size so as to save yourself from the stress as mentioned earlier. That is why we have created the below valve length to the rim depth chart. ![]() It might be even more fun if you have gone tubeless, trying to find 80mm tubeless valves is fantastic fun when you are pushed for time. You then have a hectic morning trying to find tubes with the correct length valve or valve extenders to make tubes you already have fit. You’ll get a puncture the day before a ride out with friends or a race that you are targeting, although that is more likely to be a mysterious puncture that appears from nowhere and deflates your tire magically during the night. We felt that we could save you from that problem it will always be a problem when you least expect it. The external threads on the main body of "threaded" Presta valves are 6V1, which measures 6×0.80 mm.One of the stumbling blocks for many people is what size of valves they need when they want to buy deep section carbon fiber wheels. The external threads at the tip of both "threaded" and "unthreaded" Presta valves are 5V2 (#12-24TPI), which measures out to 5.2×1.058 mm, the same thread size as the tip of a Dunlop valve. The valve threads for Presta valves follow the ISO 4570 standard. There are two variants of valve extenders depending on whether the Presta core is removable. Valve extenders can be used to lengthen shorter Presta valves to accommodate deeper and thicker rims, such as those on aerodynamic race wheels. Valve extenders A valve extender (black) is fitted beween valve stem (brass) and core (silver). Sealant may also be added by pouring it directly into the tire. Presta valves with removable cores may be used with a tubeless setup to add sealant through the valve. Unlike Schrader valves, not all Presta valves have removable cores. Removable valve cores Removed Presta valve core The same adapter, because of a coincidence of thread sizes, may be able to convert a Schrader pump into one that can connect to flexible adapters of either kind. An adapter can be fitted onto this external thread to permit the Presta valve to be connected to a pump with a Schrader chuck. The standard Presta valve has an external thread. Two views of a Presta to Schrader valve adapter Conversely, when a Presta valve is fitted into the larger Schrader rim hole, grommets or reducers are sometimes used to take up the extra space. The holes in rims sized for Presta valves can be enlarged to accommodate the wider Schrader valves, which can structurally weaken the rim. The valve cap protects the valve body, keeps dirt and mud out of the mechanism, and also prevents the valve from damaging the tube when it is rolled for storage, but is not necessary to prevent pressure loss. The screw remains captive on the valve body even when unscrewed fully it is tightened again after the tire is inflated and the pump removed. The nut must be unscrewed to permit airflow in either direction. 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. ![]() The air pressure in an inflated tire holds the inner valve body shut. The smaller hole for a Presta valve makes it possible to have extremely narrow wheels while maintaining sufficient strength in the wheel. The weakest point of a bicycle rim is usually the hole for the valve stem. The outer valve stem is manufactured in various lengths for different applications and has a narrower diameter (6 mm (0.24 in)) than Dunlop and Schrader valves (8 mm (0.31 in)). Presta or presto stands in the Romance languages for "fast, hurry, immediately". The Sclaverand valve was invented by Frenchman Etienne Sclaverand and is often referred to as the French valve. A lock nut to secure the stem at the wheel rim and a valve cap may also be present. It comprises an outer valve stem and an inner valve body. The Presta valve (also French valve ( FV) or Sclaverand valve) is a tire valve commonly found in high pressure road style and some mountain bicycle inner tubes.
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