The Schrader valve (also called American valve) The Schrader valve consists of a valve stem into which a valve core is threaded, and is used on virtually all automobile tires and motorcycle tires and most wider rimmed bicycle tires. The valve core is a poppet valve assisted by a spring and has a larger diameter (8 mm)
Schrader Valves are often found on Air Sprung Suspension Units, although some older models may require OEM adaptors (Marzocchi)
The Presta valve (also called Sclaverand valve or French valve) is a valve commonly found in high pressure road style and some mountain bicycle inner tubes
The outer valve stem is manufactured in various lengths for different applications, and has a narrower diameter (6 mm)
Valve stem length varies especially with Deep-section Aero Rims and you’ll possibly need an angled valve for a push-chair wheel.