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Home
› Tire Size Comparison Calculator
Tire Size Comparison Calculator
Compare two tire sizes — see diameter difference, speedometer error, and ground clearance change.
Original Tire Size (e.g. 225/65R17)
New Tire Size (e.g. 235/70R17)
Compare
Measurement
Original
New
Difference
What the numbers mean:
225
= section width in mm,
65
= aspect ratio (sidewall height as % of width),
R17
= rim diameter in inches
Speedometer error: positive = speedometer reads faster than actual; negative = reads slower
Stay within ±3% diameter change to avoid affecting ABS, odometer accuracy, and speedometer
Larger tires may also require clearance checks in wheel wells