265/60R20 vs 275/55R20: full comparison
| Measurement | 265/60R20 | 275/55R20 | Difference |
|---|---|---|---|
| Diameter | 32.52 in | 31.91 in | −0.61 in−1.9% |
| Section width | 10.43 in | 10.83 in | +0.39 in+3.8% |
| Sidewall height | 6.26 in | 5.95 in | −0.31 in−4.9% |
| Circumference | 102.16 in | 100.25 in | −1.92 in−1.9% |
| Revs per mile | 620 | 632 | +12+1.9% |
Speedometer: indicated vs actual speed
With 275/55R20 fitted where 265/60R20 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 19.6 mph | −0.4 mph |
| 30 mph | 29.4 mph | −0.6 mph |
| 40 mph | 39.2 mph | −0.8 mph |
| 50 mph | 49.1 mph | −0.9 mph |
| 55 mph | 54.0 mph | −1.0 mph |
| 60 mph | 58.9 mph | −1.1 mph |
| 65 mph | 63.8 mph | −1.2 mph |
| 70 mph | 68.7 mph | −1.3 mph |
| 75 mph | 73.6 mph | −1.4 mph |
| 80 mph | 78.5 mph | −1.5 mph |
Recalculate for a gear ratio change too →
Will 275/55R20 fit where 265/60R20 was?
At −1.9%, 275/55R20 is within the ±3% most tire shops and manufacturers accept without recalibrating the speedometer or expecting rubbing -- it should generally bolt on, though wheel width, offset, and suspension travel still matter.
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- Speedometer calculator: true speed after a tire or gear ratio change.
Frequently asked questions
How much bigger is 275/55R20 than 265/60R20?
275/55R20 is 0.61 in shorter in overall diameter (−1.9%) and 0.39 in wider in section width (+3.8%) than 265/60R20.
Will 275/55R20 fit in place of 265/60R20?
At −1.9%, 275/55R20 is within the ±3% most tire shops and manufacturers accept without recalibrating the speedometer or expecting rubbing -- it should generally bolt on, though wheel width, offset, and suspension travel still matter.
Does swapping to 275/55R20 affect my speedometer?
With 275/55R20 fitted where 265/60R20 was calibrated, an indicated 60 mph is really about 58.9 mph. That small a difference is within the ±3% most shops treat as close enough not to recalibrate.
Does 275/55R20 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 275/55R20 changes ride height by about 0.31 in lower compared with 265/60R20.
Do 265/60R20 and 275/55R20 use the same wheel (rim) diameter?
Yes -- both fit a 20 inch wheel, so only the tire itself changes, not the wheel.