Bolt Circle Guide
Bolt Circle: Diameter of a virtual circle passing through the center of all bolt holes.
4-Lug Bolt Pattern
Common Sizes:
- Light Duty American Hubs – Measurement "A" = 2-13/16"
- Heavy Duty American Hubs – Measurement "A" = 4"
- Heavy Duty Metric Hubs – Measurement "A" = 110mm or 115mm
3-Lug Bolt Pattern (Racing)
- American – Measurement "A" = 2-1/2"
- Metric – Measurement "A" = 58mm
Bolt-to-Bolt Measurements for 3-Lug Patterns
A = Bolt to Bolt (center to center)
B = Bolt Circle
Formula to Determine 3-Lug Bolt Circle:
- Bolt to Bolt (center to center) ÷ 0.864 = Bolt Circle
- Example: 2.16" ÷ 0.864 = 2.50"
Common 3-Lug Sizes
| Bolt to Bolt (A) | Bolt Circle (B) | Common Uses |
|---|---|---|
| 2.16" (55mm) | 2.50" (64mm) | American Racing Rims & Wheel Hubs |
| 1.97" (50mm) | 2.28" (58mm) | Shifter (Metric) Racing Rims & Wheel Hubs |
| 2.28" (58mm) | 2.64" (67mm) | Shifter (Metric) Racing Rims & Wheel Hubs |
| 3.03" (77mm) | 3.50" (89mm) | 3-Bolt Hole Chinese ATV Wheels |
