Calcometry
By using our calculators, you agree to our Terms of Use.
Tire Size Calculator
Compare stock vs new tire overall diameter — important for speedometer accuracy.
Tire sizes
Compare overall diameter from metric tire codes (e.g. 205/55R16).
Stock tire
New tire
Diameter difference
0.43 in
1.74% vs stock · Stock: 24.88 in
- Stock diameter
- 24.88 in
- New diameter
- 25.31 in
Ad slot A · Below calculator
Related calculators
Tire diameter
Sidewall height = width × aspect ratio ÷ 100. Overall diameter = 2 × sidewall + rim diameter.
Ad slot B · Mid content