Speedometer Error & Tire Size Calculator
See how your real speed and odometer change when you change tire size.
Stock tire (e.g. 215/60R16)
New tire
Stock diameter
26.16 in
New diameter
26.74 in
Speedo error
+2.24%
Actual speed at 60 mph indicated
61.35 mph
Odometer drift
+2.24% (reads MORE miles than actual)
Minor offset, within typical OEM tolerance for production cars.
Diameter = 2 × sidewall (mm / 25.4) + wheel diameter. Negative % means new tire is smaller — actual speed is lower than indicated.
このツールについて
Enter stock and new tire sizes (width, aspect ratio, wheel diameter). Get the speedometer error %, the actual speed at 60 mph indicated, and the odometer discrepancy over a year. Targets the r/cars, r/Truck, r/4x4, and r/Subaru recurring 'will my speedometer be off' question when changing tire size.
関連ツール
他にも役立つ計算機があります。
他のカテゴリー
お探しのものが違いますか？カタログの他のツールもご覧ください。
スポンサーからの提案
- Found a money leak? Track every dollar with a budgeting app
YNAB, Monarch, and Copilot Money all offer free trials. We use YNAB ourselves.
- Save on your energy bill: pick a cheaper electricity rate
Compare local rates in 2 minutes with EnergySage (US).
- Like this site? You'll love our weekly newsletter
One new tool, one fresh Reddit pain point, every Friday. No spam.
以下のリンクにはアフィリエイトリンクが含まれる場合があります。リンク経由で購入されると、追加費用なしで当サイトが手数料を受け取ることがあります。