Tire Diameter Calculator

Rim plus two sidewall heights.

Choose a tire workflowCalculate one diameter or compare two tire sizes and speedometer effect.

2 options

Width

Aspect ratio

Rim

TIRE DIAMETER26.744094 in

rim + 2 × width × aspect ÷ 100 ÷ 25.4; Sidewall height and circumference are derived. Only inputs needed by this operation are shown.

Estimate based on the values shown

Formula checkedDiameter = rim + 2×sidewall; comparison reports the second tire's diameter difference.

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