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Air Valve Sizing Guide | Understanding Schrader Valve DimensionsUpdated a month ago
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 |
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.
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.
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.
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.