TireSizeCheck

Compare any two tire sizes

Enter your current tire and the size you’re considering. The verdict, speedometer error and every key measurement update instantly. You can also pre-fill this page with a link like /compare/?old=205-55r16&new=225-45r17.

1Current tire

205/55R16

2New tire

225/45R17

225/45R17 on a vehicle fitted with 205/55R16: This fits

Diameter moves 0.4%, 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.

Measurement205/55R16225/45R17Change
Overall diameter24.88″24.97″+0.09″ (+0.4%)
Sidewall height4.44″ (112.8 mm)3.99″ (101.3 mm)−11.5 mm
Tread width205 mm225 mm+20 mm
Circumference78.16″78.45″+0.30″
Revs per mile811808−3
Speedometer errorbaseline+0.4%reads low
Diameter overlay
205/55R16 225/45R17
Speedometer check

When your speedometer shows the indicated speed with 225/45R17 fitted, your actual speed is:

25 mph shown

25.1 mph actual

35 mph shown

35.1 mph actual

45 mph shown

45.2 mph actual

55 mph shown

55.2 mph actual

65 mph shown

65.2 mph actual

75 mph shown

75.3 mph actual

View full comparison page225/45R17 details

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2,156 comparison pages cover 150 common tire sizes. Pick your current size below to see every practical swap for it, each with the diameter change, speedometer error and a fit verdict.

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