TruckTireGuide.com Semi Truck Tire Reference

Semi Truck Tire Sizes

11R22.5 vs 295/75R22.5

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The common mistake is treating 11R22.5 and 295/75R22.5 as the same tire because both fit a 22.5-inch wheel. They may be close in some applications, but close is not the same as approved.

The right comparison starts with dimensions, then moves to load capacity, dual spacing, loaded radius, and fleet policy.

This site is for general information only. It does not replace professional tire service, DOT compliance advice, tire manufacturer instructions, vehicle manufacturer recommendations, or fleet policy.

What the numbers mean

11R22.5 is an older inch-based radial size format. 295/75R22.5 is a metric low-profile size format. Both include the rim diameter, but they express section width and profile differently. The 295 in the metric format is section width in millimeters; the 75 is the aspect ratio (sidewall height as a percentage of section width).

Typical dimension comparison

Typical values from published manufacturer data — exact figures depend on the specific tire brand and model. Confirm from manufacturer data sheets before making a substitution decision.

Dimension11R22.5 (typical)295/75R22.5 (typical)Why it matters
Overall diameter41.2 – 41.5 in39.4 – 40.0 inAffects speedometer, gearing, ride height, and dual matching
Section width10.8 – 11.0 in11.4 – 11.7 inAffects rim width approval and dual spacing clearance
Revolutions / mile494 – 500515 – 524Different rolling circumference — do not assume odometers stay accurate
Loaded radius19.8 – 20.0 in18.9 – 19.3 inChanges fifth-wheel and dock height relationship

Key differences in practice

  • The 11R22.5 is approximately 1.5 to 2 inches taller in overall diameter than the 295/75R22.5.
  • The 295/75R22.5 is generally wider in section width despite being shorter in profile.
  • Mixing the two sizes in a dual set causes diameter mismatch and load imbalance.
  • A fleet moving from one to the other should verify speedometer accuracy, clearance, and load tables.

Size Verification Checklist

  • Match by manufacturer data, not forum advice.
  • Do not pair different rolling diameters in a dual set.
  • Verify the wheel width is approved for the tire.
  • Recheck inflation guidance after any size change.

FAQ

Are 11R22.5 and 295/75R22.5 tires interchangeable?

They are not automatic substitutes. Both fit a 22.5-inch rim diameter, but they differ meaningfully in overall diameter, section width, loaded radius, and revolutions per mile. The 295/75R22.5 is typically about 1.5 to 2 inches shorter in overall diameter. This affects speedometer accuracy, gearing feel, fifth-wheel height, and dual matching. Any substitution must be confirmed against manufacturer data for the specific tires involved.

Which is bigger — 11R22.5 or 295/75R22.5?

The 11R22.5 is typically taller, with an overall diameter roughly 1.5 to 2 inches larger than the 295/75R22.5. The 295/75R22.5 is generally wider in section width. For dual assembly clearance checks, ride height, and gearing effects, overall diameter is the more important dimension to compare.

Does changing from 11R22.5 to 295/75R22.5 affect the speedometer?

Yes. A change in overall diameter changes revolutions per mile, which affects speedometer accuracy. The difference between these two sizes — roughly 20 to 30 revolutions per mile — is enough to produce a noticeable speedometer discrepancy. Confirm the actual diameter difference using manufacturer data and evaluate whether speedometer recalibration is needed before completing a fleet-wide size change.

Source Notes

References are used for context and verification. Exact tire service decisions should use current manufacturer data, applicable regulations, and qualified inspection.