Tire Size Calculator
Compare two tire sizes and see how a change affects overall diameter, sidewall height and speedometer reading.
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Current tire225/65 R17
New tire235/60 R18
Comparison
SafeOverall diameter
+1.5 cm (+2.06%)
Sidewall height
-5.3 mm
Circumference
+2.06%
Speedometer shows60 km/hactual speed61.2 km/h
A difference of up to 3% in overall diameter is generally considered safe. Larger changes may affect handling, speedometer accuracy and ground clearance.