275/60R20 vs 275/65R20: Tire Size Comparison
275/65R20 is 1.08 inches taller than 275/60R20 (34.07″ vs 32.99″, +3.28%) and 0 inches wider. The difference is outside the common ±3% guideline. At an indicated 60 mph you would be doing 62 mph.
| 275/60R20 | 275/65R20 | Difference | |
|---|---|---|---|
| Overall diameter | 32.99 in | 34.07 in | +1.08 |
| Section width | 10.83 in | 10.83 in | +0 |
| Sidewall height | 6.5 in | 7.04 in | +0.54 |
| Circumference | 103.6 in | 107 in | +3.4 |
| Revolutions per mile | 611 | 592 | −19 |
275/60R20 vs 275/65R20 dimensions
| 275/60R20 | 275/65R20 | Difference | |
|---|---|---|---|
| Overall diameter | 32.99 in (838 mm) | 34.07 in (866 mm) | +1.08 in (+3.28%) |
| Section width | 10.83 in | 10.83 in | +0 in |
| Sidewall height | 6.5 in | 7.04 in | +0.54 in |
| Wheel diameter | 20 in | 20 in | same wheel |
| Circumference | 103.6 in | 107 in | +3.4 in |
| Revolutions per mile | 611 | 592 | -19 |
Nominal dimensions calculated from the size code. Real tires vary slightly by brand, tread depth and inflation.
Speedometer difference with 275/65R20
| Speedometer shows | Actual speed on 275/65R20 | Difference |
|---|---|---|
| 30 mph | 31 mph | +1 mph |
| 45 mph | 46.5 mph | +1.5 mph |
| 60 mph | 62 mph | +2 mph |
| 70 mph | 72.3 mph | +2.3 mph |
| 80 mph | 82.6 mph | +2.6 mph |
Assumes your speedometer is accurate on 275/60R20. Because 275/65R20 is taller, you travel slightly faster than indicated and the odometer under-counts: 10,000 miles on the odometer is about 10,328 real miles.
What changes if you switch
- Ride height: up about 0.54 in (half the diameter change).
- Wheels: both fit a 20-inch wheel; check the tire's approved rim width range.
- Sidewall: a taller sidewall usually rides softer and resists pothole damage, with a little less steering sharpness.
- Effective gearing: slightly taller, so marginally lower engine rpm at speed and slightly slower acceleration.
- Match the original load index and speed rating or higher, and check for rubbing at full steering lock and full suspension compression.
Related tire size comparisons
Frequently asked questions
Can I use 275/65R20 instead of 275/60R20?
275/65R20 is +3.28% in overall diameter compared with 275/60R20 (34.07″ vs 32.99″). That is outside the common ±3% guideline, so it is a bigger change that may affect the speedometer, ABS and clearance. Check your vehicle placard, load index, speed rating and clearance before switching.
How much taller is 275/65R20 than 275/60R20?
275/65R20 is 1.08 inches taller overall, which raises ride height by about 0.54 inches. Sidewall height changes from 6.5″ to 7.04″.
How much wider is 275/65R20 than 275/60R20?
Section width goes from 10.83″ (275 mm) to 10.83″ (275 mm), a difference of +0 in. Actual width also depends on the rim width it is mounted on.
How does 275/65R20 affect my speedometer?
With 275/65R20 fitted in place of 275/60R20, when the speedometer shows 60 mph you are actually going about 62 mph. The odometer will record 10,000 miles when you have driven about 10,328.