My chair base is cracked. How do I measure and find the right replacement size?
Getting the right base size is simple—measure two things: the gas cylinder diameter and the wheel stem size. Here's how:
Step 1: Measure Gas Cylinder Diameter
| Common Size | Where to Measure | Typical Fit |
|---|---|---|
| 22mm (standard) | Diameter of cylinder shaft | Most office chairs |
| 25mm (oversize) | Diameter of cylinder shaft | Heavy-duty chairs |
| 28mm (large) | Diameter of cylinder shaft | Some European chairs |
| 50mm (tapered) | Top of cylinder widens | Older models |
Step 2: Measure Wheel Stem Size
| Size | Description | Fits |
|---|---|---|
| 7/16" (11mm) | Standard office chair caster | Most common |
| 1/2" (13mm) | Slightly larger | Some heavy-duty |
| 5/16" (8mm) | Smaller | Older or imported |
Step 3: Measure Base Star Width
- Measure from center to tip of one leg
- Multiply by 2 for total width
- Standard is about 22-25 inches across
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