Tyre Size Codes: Diameter, Upsizing & Speedometer Error
This lesson is part of the course
In this lesson
You split six tyre codes into width, aspect ratio and rim size with text functions, calculate each overall diameter, compare it with the stock size and work out the true speed when the speedometer shows 100.
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Lessons in this course
- Engine Displacement from Bore & Stroke: cc, Litres & Cubic Inches Locked
- Compression Ratio: Swept Volume, Clearance Volume & a Head-Milling What-if Locked
- Horsepower & Torque: hp = Torque × RPM ÷ 5252, N·m and kW (with a Dyno Chart) Locked
- Gear Ratios & Final Drive: Road Speed at RPM and Cruise RPM Locked
- Tyre Size Codes: Diameter, Upsizing & Speedometer Error Locked
- Fuel Economy: mpg ↔ L/100 km and Fuel Cost per km Locked
- Brake & Tyre Wear: Measurements, Replacement Thresholds & Conditional Formatting Locked
- Repair Quote: Labour Hours × Rate, Parts Markup, Shop Supplies & Tax (with a Chart) Locked