Speedometer guides
Speedometer Accuracy Guides
Your speedometer is allowed to read fast, but never slow — and changing tyre size moves the error. These guides explain speedometer error, the legal tolerance, and how much a new tyre size throws your speed reading off.
Bigger Wheels Speedometer Effect: Formula, Worked Example & Speed Tables
Work out bigger wheels speedometer effect with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Do i Need to Recalibrate my Speedometer: Methods, Costs & When It Is Needed
Work out do i need to recalibrate my speedometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.
GPS Speedometer Calibration: GPS vs Speedometer Compared
Work out gps speedometer calibration with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
How Accurate Is my Speedometer: Causes, Checks & Fixes
Work out how accurate is my speedometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
How Does Tyre Size Affect Speedometer Reading: Formula, Worked Example & Speed Tables
Work out how does tyre size affect speedometer reading with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
How Much Can a Speedometer Be Out: Causes, Checks & Fixes
Work out how much can a speedometer be out with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
How to Calculate Odometer Error: How the Mileage Error Works
Work out how to calculate odometer error with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
How to Calculate Speedometer Correction Factor: Formula, Worked Example & Tables
Work out how to calculate speedometer correction factor with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
How to Calculate Speedometer Error: Formula, Worked Example & Tables
Work out how to calculate speedometer error with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
How to Calculate Speedometer Error Percentage: Formula, Worked Example & Tables
Work out how to calculate speedometer error percentage with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
How to Calibrate Speedometer: Methods, Costs & When It Is Needed
Work out how to calibrate speedometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
How to Fix Speedometer After Bigger Tyres: Methods, Costs & When It Is Needed
Work out how to fix speedometer after bigger tyres with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph...
How to Recalibrate Speedometer: Methods, Costs & When It Is Needed
Work out how to recalibrate speedometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
How to Use a Speedometer Calibration Tool: Methods, Costs & What Affects the Price
Work out how to use a speedometer calibration tool with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph...
Motorcycle Speedometer Error Calculator: Error Formula & Worked Example for Bikes
Work out motorcycle speedometer error calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.
Odometer Correction Calculator: How the Mileage Error Works
Work out odometer correction calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Odometer Error After Tyre Change: How the Mileage Error Works
Work out odometer error after tyre change with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Smaller Tyres Speedometer Effect: Formula, Worked Example & Speed Tables
Work out smaller tyres speedometer effect with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedo Error Calculator: Formula, Worked Example & Speed Tables
Work out speedo error calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Check every figure by hand.
Speedometer Accuracy Calculator: Formula, Worked Example & Speed Tables
Work out speedometer accuracy calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Accuracy Law UK: What the Law Requires in the UK & USA
Work out speedometer accuracy law uk with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Accuracy Law USA: What the Law Requires in the UK & USA
Work out speedometer accuracy law usa with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer and Odometer Error Calculator: How the Mileage Error Works
Work out speedometer and odometer error calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph...
Speedometer Calculator Tyre Size: Formula, Worked Example & Speed Tables
Work out speedometer calculator tyre size with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Calibration After Tyre Size Change: Methods, Costs & When It Is Needed
Work out speedometer calibration after tyre size change with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
Speedometer Calibration Calculator: Methods, Costs & When It Is Needed
Work out speedometer calibration calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Calibration Tool: Methods, Costs & What Affects the Price
Work out speedometer calibration tool with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Correction Calculator: Formula, Worked Example & Speed Tables
Work out speedometer correction calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Correction Factor Calculator: Formula, Worked Example & Speed Tables
Work out speedometer correction factor calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 145/80R13 to 155/70R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 145/80r13 to 155/70r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 145/80R13 to 165/70R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 145/80r13 to 165/70r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/65R13 to 165/60R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/65r13 to 165/60r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/70R13 to 155/65R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/70r13 to 155/65r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/70R13 to 165/60R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/70r13 to 165/60r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/70R13 to 165/65R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/70r13 to 165/65r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/70R13 to 175/60R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/70r13 to 175/60r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/80R13 to 165/70R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/80r13 to 165/70r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 155/80R13 to 175/70R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 155/80r13 to 175/70r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/65R13 to 155/65R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/65r13 to 155/65r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/65R13 to 165/60R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/65r13 to 165/60r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/65R13 to 175/60R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/65r13 to 175/60r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/70R13 to 155/70R14: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/70r13 to 155/70r14 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/70R13 to 175/65R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/70r13 to 175/65r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 165/70R13 to 185/60R13: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 165/70r13 to 185/60r13 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 195/65R15 to 205/55R16: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 195/65r15 to 205/55r16 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 205/55R16 to 195/65R15: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 205/55r16 to 195/65r15 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 205/55R16 to 215/55R16: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 205/55r16 to 215/55r16 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 205/55R16 to 225/45R17: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 205/55r16 to 225/45r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 225/45R17 to 215/50R17: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 225/45r17 to 215/50r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 225/45R17 to 235/40R18: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 225/45r17 to 235/40r18 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 235/65R17 to 245/65R17: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 235/65r17 to 245/65r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 245/40R18 to 255/35R19: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 245/40r18 to 255/35r19 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 265/70R17 to 275/65R18: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 265/70r17 to 275/65r18 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error 265/70R17 to 285/70R17: Indicated vs Actual Speed at 30, 50 & 70 mph
Work out speedometer error 265/70r17 to 285/70r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph....
Speedometer Error After Bigger Tyres: Formula, Worked Example & Speed Tables
Work out speedometer error after bigger tyres with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Error After Lift Kit: Error After Bigger Tyres & How to Fix It
Work out speedometer error after lift kit with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Error After Regearing: Error After Bigger Tyres & How to Fix It
Work out speedometer error after regearing with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Error at 100 KMH: Actual Speed for Every Error Percentage
Work out speedometer error at 100 kmh with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 100 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 100 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 30 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 30 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 50 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 50 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 60 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 60 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 70 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 70 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error at 80 MPH: Actual Speed for Every Error Percentage
Work out speedometer error at 80 mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error Calculator: Formula, Worked Example & Speed Tables
Work out speedometer error calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error Calculator 205/55R16: Error Tables, Formula & Worked Example
Work out speedometer error calculator 205/55r16 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Error Calculator 225/45R17: Error Tables, Formula & Worked Example
Work out speedometer error calculator 225/45r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Error Calculator 235/65R17: Error Tables, Formula & Worked Example
Work out speedometer error calculator 235/65r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Error Calculator 245/40R18: Error Tables, Formula & Worked Example
Work out speedometer error calculator 245/40r18 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Error Calculator 265/70R17: Error Tables, Formula & Worked Example
Work out speedometer error calculator 265/70r17 with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Error Calculator for Jeep: Error Formula & Worked Example
Work out speedometer error calculator for jeep with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Error Calculator for Motorcycles: Error Formula & Worked Example for Bikes
Work out speedometer error calculator for motorcycles with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
Speedometer Error Calculator for Trucks: Error Formula & Worked Example for Trucks
Work out speedometer error calculator for trucks with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.
Speedometer Error Calculator KMH: Formula, Worked Example & Speed Tables
Work out speedometer error calculator kmh with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Error Calculator MPH: Formula, Worked Example & Speed Tables
Work out speedometer error calculator mph with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Error Calculator UK: Formula, Worked Example & Speed Tables
Work out speedometer error calculator uk with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Error Chart: Error Percentages & Speed Tables
Work out speedometer error chart with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Check every figure by hand.
Speedometer Error Formula: Formula, Worked Example & Tables
Work out speedometer error formula with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Check every figure by hand.
Speedometer Error Percentage Calculator: Formula, Worked Example & Speed Tables
Work out speedometer error percentage calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.
Speedometer Error Tyre Size Change Calculator: Formula, Worked Example & Speed Tables
Work out speedometer error tyre size change calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
Speedometer Gear Change Calculator: Formula, Worked Example & Speed Tables
Work out speedometer gear change calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Over Reading Causes: Causes, Checks & Fixes
Work out speedometer over reading causes with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Programmer Cost: Methods, Costs & What Affects the Price
Work out speedometer programmer cost with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Reading Formula: Formula, Worked Example & Tables
Work out speedometer reading formula with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Reading With Bigger Tyres: Formula, Worked Example & Speed Tables
Work out speedometer reading with bigger tyres with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Reads Faster Than Actual Speed: Causes, Checks & Fixes
Work out speedometer reads faster than actual speed with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph..
Speedometer Reads Slower Than Actual Speed: Causes, Checks & Fixes
Work out speedometer reads slower than actual speed with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph..
Speedometer Recalibration Cost: Methods, Costs & What Affects the Price
Work out speedometer recalibration cost with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Speedometer Recalibration Near Me Cost: Methods, Costs & What Affects the Price
Work out speedometer recalibration near me cost with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Tables inside.
Speedometer Under Reading Causes: Causes, Checks & Fixes
Work out speedometer under reading causes with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer vs GPS Speed Calculator: GPS vs Speedometer Compared
Work out speedometer vs gps speed calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer vs Odometer Accuracy: How the Mileage Error Works
Work out speedometer vs odometer accuracy with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Speedometer Wrong After Bigger Wheels: Causes, Checks & Fixes
Work out speedometer wrong after bigger wheels with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Worked example.
Speedometer Wrong After New Tyres: Causes, Checks & Fixes
Work out speedometer wrong after new tyres with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Tyre Size Change Speedometer Effect Calculator: Formula, Worked Example & Speed Tables
Work out tyre size change speedometer effect calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph.
Tyre Size Speedometer Calculator: Formula, Worked Example & Speed Tables
Work out tyre size speedometer calculator with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full working shown.
Tyre Size Speedometer Chart: Error Percentages & Speed Tables
Work out tyre size speedometer chart with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Why Is my Speedometer Wrong: Causes, Checks & Fixes
Work out why is my speedometer wrong with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Full tables included.
Will Bigger Tyres Affect my Speedometer: Formula, Worked Example & Speed Tables
Work out will bigger tyres affect my speedometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.
Will Changing Tyre Size Affect Odometer: How the Mileage Error Works
Work out will changing tyre size affect odometer with the error formula, a worked example and indicated-versus-actual tables at 30, 50 and 70 mph. Step by step.