![]() ![]() There are two types of extenders depending on whether the inner valve body is removable or not. The extender is threaded onto the valve and thus it can reach through the rim. The extender is used when the rim of the wheel is high for aerodynamics and the valve is too short. Valve extender vs adapterĪs we already saw the adapter makes the presta valve tire ready to be inflated it with a Schrader pump. It’s best to only resort to it if everything else fails. Putting a Schrader valve tube on a Presta- drilled rim is not completely impossible, but it can be very tricky. 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. 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. Long stem Presta Presta valve in Schrader rim holes.The ideal is that the valve sticks out about 1.25” (32 mm) above the rim but it won’t hurt if the valve is longer than that. Their lengths differ from 32 mm to 80 mm. Some aerodynamically designed rims are thicker and need a longer valve stem. There are Presta valves of different lengths for different types of rims. So, if you have a Presta valve tire you either need to get a pump compatible with Presta valves or you get an adapter that fits the valve. ![]() The BV Bicycle Ergonomic Bike Floor Pump is a solid, yet inexpensive choice available on Amazon. You can also get dual-head pumps, which can be swappable, twin-head or all-in-one. You can even leave the adapter on after use if you want to keep it handy. With the adapter on you can use the Schrader pump to inflate the tires. To pump up your tire unscrew the little nut on the valve’s top, screw the adapter onto the stem. You only need an adapter if you have a Schrader pump and a Presta valve, which can also be picked up in any bike shop for pennies. If your pump is capable of both standards you don’t need an adapter for your Presta valve. You can find bike pumps for Presta valves or dual-head design pumps (for Schraer and Presta) in any bike shop. Don’t forget to tighten the screw after finishing as your tube will start to lose pressure. Then place the pump head on the valve and fill the tire with air. ![]() This ensures that air can freely enter, but it can only escape if the head is pressed down on. To put air in a Presta valve first you need to loosen the locknut. On the other hand, Schrader is more robust and somewhat easier to pump up. There are two main advantages of Presta valves over Schrader: they are more slender than and once the nut is secured they cannot be accidentally deflated. The Presta valve needs a smaller hole on the rim and thus it permits to have really narrow wheels having sufficient strength in the rim. The weakest part of the bicycle rim is where the hole is for the valve stem. The lock nut secures the stem where it meets the rim. It has a locknut, an outer valve stem, an inner valve body and sometimes it comes with a valve cap. The Presta valve is narrower in diameter (0.6 mm) than the Schrader valve (0.8 mm). A Schrader and a Presta valve next to each other ![]()
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