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Hi, Does anyone know of inner tube Shrader valve cores that do not leak air? Seems most cores leak air to a small degree, as I have to pump my tires every ride. Just wondering if there are cores on the market that are best at holding the air. Thanks!

I like Skol

A Minging Manc...
There is no such thing, and no need for it. Unless you have a faulty set of valves the Schrader system is very reliable.
How often are you having to pump up your tyres? Every ride might be daily or every couple of months. Bike tyres do go down over time naturally, the speed of this varies according to tube type, size, pressure, slow punctures and lastly faulty valves.
If you are having to blow up your tyres daily, or every couple of days you most likely have slow punctures.
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