215/60R16 vs 225/60R16
New overall diameter
26.63″
was 26.16″
True speed at an indicated 60
61.1 mph
your speedo reads low
Revolutions per mile
757
was 771, −14
| Measurement | 215/60R16 | 225/60R16 | Change |
|---|---|---|---|
| Overall diameter | 26.16″ | 26.63″ | +0.47″ (+1.8%) |
| Sidewall height | 5.08″ (129.0 mm) | 5.31″ (135.0 mm) | +6.0 mm |
| Tread width | 215 mm | 225 mm | +10 mm |
| Circumference | 82.18″ | 83.66″ | +1.48″ |
| Revs per mile | 771 | 757 | −14 |
| Speedometer error | baseline | +1.8% | reads low |
Diameter overlay
215/60R16 225/60R16
Speedometer check
With 225/60R16 fitted, when the speedometer shows the indicated speed, your actual speed is:
25 mph shown
25.5 mph actual
35 mph shown
35.6 mph actual
45 mph shown
45.8 mph actual
55 mph shown
56.0 mph actual
65 mph shown
66.2 mph actual
75 mph shown
76.4 mph actual
Common questions
- Will 225/60R16 fit instead of 215/60R16?
- Diameter moves 1.8%, comfortably inside the 3% rule. Your speedometer, ABS, traction control and gearing all stay in the range they were calibrated for. Your speedometer will read low, so you are going faster than it says. Overall diameter goes from 26.16″ to 26.63″, a change of +1.8%. The rule of thumb most shops use: under 3% is fine, 3 to 5% needs a clearance check, over 5% needs recalibration.
- How far off will my speedometer read on 225/60R16?
- At an indicated 60 mph you are really doing about 61.1 mph, a +1.8% error. The speedometer reads low, so you are going faster than it shows.
- What is the difference in revolutions per mile between 215/60R16 and 225/60R16?
- 215/60R16 turns about 771 times per mile and 225/60R16 turns about 757, a difference of −14. Your speedometer and odometer both count rotations, so this number is what throws them off.