How to Read Golf Cart Tire Size: A Step-by-Step Guide
Golf cart tire sizes are printed as a series of numbers (e.g., 18x8.50-8). The first number is the tire diameter, the second is width, and the last is rim diameter. Letters like "ST" indicate tire type, while load ratings and speed symbols may also appear.
Understanding the Tire Size Code
The format follows: Diameter x Width - Rim Size. Example: 20x10.00-10 means:
- 20: Overall tire diameter (inches).
- 10.00: Section width (inches).
- 10: Rim diameter (inches).
Common Tire Size Formats Explained
| Format Example | Diameter (in) | Width (in) | Rim Size (in) | Type |
|---|---|---|---|---|
| 18x8.50-8 | 18 | 8.5 | 8 | Standard |
| 22x11.00-10 ST | 22 | 11.0 | 10 | Special Trailer (ST) |
| 205/50-10 | ~20.3 | 8.1 (mm converted) | 10 | Metric (width in mm) |
Additional Markings and What They Mean
- Load Index (e.g., 4PR or 6PR): Ply rating (higher = stronger).
- Speed Symbol (e.g., "B"):
- A1: Up to 3.1 mph (walking speed).
- B: Up to 31 mph.
- C: Up to 50 mph.
- ST: "Special Trailer" (heavier-duty).
- DOT: Meets U.S. safety standards.
How to Measure Your Tire Manually
- Diameter: Measure from the ground to the top of the tire (x2).
- Width: Measure the widest point of the tread.
- Rim Size: Check the inner rim edge (often stamped).
Why Tire Size Matters
- Performance: Wrong size affects speed, torque, and handling.
- Clearance: Oversized tires may rub against the cart body.
- Load Capacity: Undersized tires risk blowouts under weight.