215/60R16 vs 225/55R17
Switching from 215/60R16 to 225/55R17 changes the overall diameter by +14.9 mm (+2.2%) — inside the commonly used ±3% guideline. Every figure below is calculated from the two size codes with the standard formulas.
| Measurement | 215/60R16 | 225/55R17 | Difference |
|---|---|---|---|
| Overall diameter | 664.4 mm | 679.3 mm | +14.9 mm (+2.2%) |
| Overall diameter | 26.16 in | 26.74 in | +0.59 in |
| Tire width | 215 mm (8.46 in) | 225 mm (8.86 in) | +10 mm |
| Sidewall height | 129.0 mm (5.08 in) | 123.8 mm (4.87 in) | -5.3 mm |
| Wheel (rim) diameter | 16.0 in | 17.0 in | +1.0 in |
| Circumference | 2087 mm | 2134 mm | +47 mm |
| Revolutions per mile | 2422 | 2369 | -53 |
| Revolutions per km | 479 | 469 | -11 |
Speedometer error
Calibrated for 215/60R16, the speedometer under-reads or over-reads once 225/55R17 is fitted. This is your real speed at each indicated speed:
| Speedometer shows | Actual speed on 225/55R17 | Error |
|---|---|---|
| 20 mph | 20.4 mph | +0.4 mph |
| 40 mph | 40.9 mph | +0.9 mph |
| 60 mph | 61.3 mph | +1.3 mph |
| 80 mph | 81.8 mph | +1.8 mph |
| 100 mph | 102.2 mph | +2.2 mph |
How these two sizes are worked out
215/60R16 breaks down as a 215 mm tread width with a sidewall of 60% of that width (129.0 mm) on a 16.0-inch wheel, giving an overall diameter of 664.4 mm (26.16 in). 225/55R17 works out to 679.3 mm (26.74 in) the same way. The standard formulas are the same ones used on the tire size calculator page: diameter = rim × 25.4 + 2 × sidewall, circumference = π × diameter, revolutions per mile = 63,360 ÷ diameter in inches.
Nominal sizes vary slightly between brands and models, and tread wear shrinks a tire over its life. These figures follow the size codes exactly; your vehicle manual or a professional tire shop is the authority for what fits your vehicle.
More comparisons
Frequently asked questions
Can I replace 215/60R16 tires with 225/55R17?
The diameter change is +2.2%, which is within the commonly used ±3% guideline. Diameter is only one part of fitment — wheel width range, load index, speed rating and physical clearance all have to check out too, so confirm with your vehicle manual or a professional tire shop before buying.
Will 225/55R17 make my speedometer read wrong?
Yes, by the diameter ratio. When the dial shows 60 mph you are really doing 61.3 mph on 225/55R17. The full table above covers 20 to 100 mph.
Which tire is taller, 215/60R16 or 225/55R17?
225/55R17 is taller — 679.3 mm against 664.4 mm overall diameter, a difference of 14.9 mm.