ADDENDUM
Metric Conversion Chart / Maximum Legal Tire Weight
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| Critical Axles: In Order of Importance
1
Outer 1st Thru Last
2
Inner 2nd Thru Last
3
Intermediate 1st to Last Drive |
* Must meet Federal Bridge Formula
Metric Conversion Chart for Maximum Legal Tire Weight
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| Nominal Width (inches) | Weight (pounds per tire) |
| 215/75R17.5 | 8.5 | 12,000 lbs |
| 225/70R19.5 | 9.0 | 12,000 lbs |
| 235/80R22.5 | 9.0 | 12,000 |
| 245/70R19.5 | 10.0 | 13,000 |
| 255/70R22.5 | 10.0 | 13,000 |
| 255/80R22.5 | 10.0 | 13,000 |
| 275/80R22.5 | 11.0 | 15,000 |
| 295/80R22.5 | 12.0 | 16,000 |
| 315/80R22.5 | 13.0 | 17,000 |
| 385/65R22.5 | 15.0 | 20,000 (Interstate)
22,000 (non-Interstate) |
| 425/65R22.5 | 16.5 | 20,000 (Interstate)
22,000 (non-Interstate) |
| 445/65R22.5 | 18.0 | 20,000 (Interstate)
22,000 (non-Interstate) |
Maximum Allowable Axle Weights for Single Mounted Various Size Tires
Metric Min/Max= InchesWeight Allowed
191 - 215 | = 8 inches | 11,000 lbs |
216 – 241 | = 9 inches | 12,000 lbs |
242 – 266 | = 10 inches | 13,000 lbs |
267 – 291 | = 11 inches | 15,000 lbs |
292 – 317 | = 12 inches | 16,000 lbs |
318 – 342 | = 13 inches | 17,000 lbs |
343 – 368 | = 14 inches | 19,000 lbs |
369 + | = 15 + inches | 20,000 lbs (Interstate)
22,000 lbs (non-Interstate) |
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