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Air Valve Sizing Guide | Understanding Schrader Valve Dimensions

Proper knowledge of air valve sizing is essential for maintaining and servicing your scooter tires. Most electric scooters use the same type of valve, typically a Schrader valve, but understanding its dimensions can help with selecting the right pumps, adapters, or replacement valves.

 

Key Valve Dimensions

  • All our scooters have the same valve type
Column 1 Column 2
External Thread Internal Thread
7.7 mm OD, thread root diameter is 6.9 mm x 0.794 mm pitch. 5.30 mm OD x 0.706 mm pitch

  1. Root

    • The root is the innermost part of the thread. It represents the base diameter if the threading were removed.

    • For more technical details on thread terminology, see Bolt Science - Thread Basics.

  2. Root Diameter

    • While most screw and valve diameters are measured by the outside diameter (major nominal diameter), the root diameter is the smallest diameter of the thread.

    • It is effectively the diameter if the thread peaks were filed off.

  3. Pitch

    • Thread pitch is the distance between consecutive peaks of the threads.

    • Knowing the pitch ensures that replacement valves or adapters properly fit the threading without cross-threading.

  4. Outer Diameter (OD)

    • The OD, or major nominal diameter, is the largest diameter of the threaded section.

    • This is the measurement typically used to match valves with pumps or accessories.

Notes

  • All our scooters use the same Schrader-type valve, so measurements are consistent across models.

  • Understanding root, pitch, and OD can help when ordering replacements or using specialized tire accessories.