Tire & Wheel Subtools Directory

Tire Diameter Calculator

Find how tall a tire stands. Read it in inches or mm.

Tire Circumference Calculator

Find the distance around a tire. It is one full turn.

Tire Radius Calculator

Find the tire's radius. That is half its height, with no load on it.

Tire Sidewall Height Calculator

Find the sidewall from the width and the aspect ratio.

Tire Section Width Calculator

Work back to the width from the other sizes.

Tire Aspect Ratio Calculator

Find the aspect ratio from the sidewall and the width.

Rim Diameter Calculator

Find the rim size from the tire's height and sidewall.

Front-to-Rear Circumference Calculator

See how far apart front and rear tires roll.

Corrected Distance Calculator

Fix the miles on the odometer.

Outer Tire Position Calculator

See how far the tire moves out to the fender.

Approved Rim Width Checker

Check the rim widths the tire maker allows.

Rim-Dependent Section Width Estimator

See how the rim width changes the tire width.

Tire Revolutions per Mile Calculator

See how many times a tire turns in one mile.

Tire Revolutions per Kilometer Calculator

See how many times a tire turns in one km.

Tire Revolutions per Second Calculator

See how fast a tire spins at a set speed.

Tire RPM Calculator

See how many turns a wheel makes each minute.

Measured Tire Rollout Calculator

Roll the tire once, then find its real size.

Metric Tire Size Decoder

Read a code like 225/45R17. Each part is explained.

Flotation Tire Size Decoder

Read a code like 33x12.50R15. Each part is explained.

Metric-to-Inch Tire Converter

Turn a metric size into inches.

Inch-to-Metric Tire Converter

Find the metric size that is close to an inch size.

Tire Width Unit Converter

Switch tire width between mm and inches.

Tire Diameter Unit Converter

Switch tire height between mm and inches.

Tire Circumference Unit Converter

Switch the distance around a tire between units.

Tire Size Input Validator

Check that a tire code is typed the right way.

Tire Size Comparison Calculator

Put two tire sizes side by side. See every change.

Multiple Tire Size Comparator

Compare three or more sizes at once.

Tire Height Difference Calculator

See how much taller or shorter a new tire is.

Tire Width Difference Calculator

See how much wider or thinner a new tire is.

Sidewall Difference Calculator

See how the sidewall changes from one size to the next.

Circumference Difference Calculator

See how the distance around the tire changes.

Rim Diameter Difference Calculator

See how the rim size changes between two sizes.

Revolutions Difference Calculator

See how turns per mile change with a new size.

Stock vs Replacement Tire Calculator

Check a new size against the one your car came with.

Nominal vs Published Dimension Comparator

Compare the math with what the maker lists.

Exact Tire Model Dimension Comparator

Compare the real size of two tire models.

Loaded Radius Comparator

Compare how tall each tire sits under a load.

Rolling Circumference Comparator

Compare how far each tire rolls in one turn.

AWD Tire Matching Tool

Check that all four tires match for AWD.

Spare Tire Size Comparator

Compare your spare with the tires on the road.

Full-Size Spare Matching Tool

Check that a full spare matches the other four.

Measuring Rim Width Comparator

Compare the rim each maker used to measure.

Equivalent Tire Diameter Finder

Find sizes that are about as tall as yours.

Same-Rim Alternative Size Finder

Find other sizes that fit the rim you have.

Target Sidewall Height Calculator

Find sizes with the sidewall you want.

Target Overall Diameter Calculator

Find the aspect ratio that hits your height.

Target Tire Width Finder

Find sizes in the width you want.

Custom Diameter Tolerance Filter

Set your own limit for how much the height can change.

Plus-One Tire Size Calculator

Go one inch up in wheel size. Keep the same height.

Plus-Two Tire Size Calculator

Go two inches up in wheel size. Keep the same height.

Custom Plus-Sizing Calculator

Go up by any wheel size and see what fits.

Minus-Sizing Calculator

Go down a wheel size, often for winter tires.

Staggered Tire Size Calculator

Use a wider tire on the back than on the front.

Speedometer Error Calculator

See how a new size changes what the speedometer shows.

Actual Speed Calculator

Find your true speed after a size change.

Indicated Speed Calculator

Find what the speedometer will show at a true speed.

Speedometer Correction Factor Calculator

Get one number to fix speed and distance.

Speedometer Correction Table Generator

Make a table of shown speed and true speed.

GPS Speed Calibration Calculator

Use a GPS to check your speedometer.

Odometer Error Calculator

See how far off the odometer reads after a size change.

Fuel Economy Reading Correction Calculator

Fix your mpg after a tire size change.

Speed Sensor Pulses Calculator

Find how many pulses the sensor sends per mile.

Effective Gear Ratio Calculator

See how tire size changes your gearing.

Engine RPM at Speed Calculator

Find engine RPM at a set road speed.

Speed at Engine RPM Calculator

Find road speed at a set engine RPM.

Gear-by-Gear Speed Calculator

See the top speed in each gear.

Tire Size and Crawl Ratio Comparator

Compare crawl ratio for off-road use.

Tractive Force Calculator

Find the push a tire puts on the road.

Winter Wheel Package Calculator

Plan a set of winter wheels and tires.

Ground Clearance Change Calculator

See how much a new size lifts or drops the car.

Wheel Arch Gap Calculator

See how the gap to the arch changes.

Measured Clearance Tire Planner

Use your own measurements to find sizes that fit.

Inner Tire Clearance Calculator

See how close the tire gets to the strut.

Wheel and Tire Fitment Comparator

Compare where two setups sit in the wheel well.

Wheel Width Calculator

Compare rim widths for a tire.

Wheel Offset Calculator

Find the offset of a wheel.

Offset Difference Calculator

See how a new offset moves the wheel.

Wheel Backspacing Calculator

Find the backspacing from width and offset.

Backspacing-to-Offset Converter

Turn backspacing into offset, and back.

Wheel Frontspacing Calculator

Find how far the wheel sticks out.

Inner Wheel Position Calculator

See how the inner rim edge moves.

Outer Wheel Position Calculator

See how the outer rim edge moves.

Spacer Effective Offset Calculator

Find the new offset with a spacer.

Target Wheel Position Calculator

Find the offset that puts the wheel where you want it.

Track Width Change Calculator

See how much wider the car's stance gets.

Wheel Bolt Pattern Comparator

Check that the bolt pattern fits your hub.

Hub Bore Comparator

Check that the center hole fits your hub.

Brake Clearance Template Checker

Check that a wheel clears your brakes.

Equivalent Axle Ratio Calculator

Find the axle ratio that brings back stock gearing.

Tire Load Index Decoder

Turn a load index into kg and lb per tire.

Tire Speed Rating Decoder

Turn a speed letter into a top speed.

Tire Load Range Decoder

Read load range letters such as C, D and E.

Standard Load vs XL Comparator

See how much more an XL tire can carry.

P-Metric vs LT Size Comparator

Compare a car tire with a light truck tire.

Single vs Dual Tire Rating Comparator

See the load limit for single and dual tires.

Load-at-Pressure Lookup Tool

Find the load a tire can carry at each pressure.

Tire Pressure Unit Converter

Switch between PSI, bar and kPa.

Tire Service Description Comparator

Compare the load and speed code of two tires.

OEM Tire Size Lookup

Find the size your car came with.

Vehicle Trim Tire Size Lookup

Find the size for your trim and wheels.

VIN-Based Tire Specification Lookup

Use your VIN to find the factory tire size.

Lifted Vehicle Tire Fitment Lookup

See what sizes fit a lifted truck.

Passenger Car Tire Size Calculator

Read a car tire code and see each size.

Light Truck Tire Size Calculator

Read LT and float sizes for trucks.

Commercial Truck Tire Size Tool

Check sizes for big trucks and their loads.

Trailer Tire Size Calculator

Compare ST tire sizes for trailers.

RV Tire Size Comparator

Compare tire and wheel needs for an RV.

ATV/UTV Tire Size Calculator

Read ATV and UTV tire codes.

Motorcycle Tire Size Calculator

Read a motorcycle tire code.

Motorcycle Inch-to-Metric Converter

Find the metric size close to an old inch size.

Motorcycle Alphanumeric Size Converter

Read old codes such as MT90-16.

Motorcycle Front/Rear Size Comparator

Compare front and rear bike tires.

Scooter Tire Size Calculator

Read scooter tire codes in mm or inches.

Bicycle Tire Size Decoder

Read bike tire codes such as 700x25C.

ETRTO Bicycle Size Converter

Read ETRTO codes such as 25-622.

French Bicycle Size Converter

Read French codes such as 700C.

Bicycle Inch Size Lookup

Sort out which 26-inch or 27-inch size you have.

Bicycle Bead-Seat Diameter Checker

Check that the tire and rim are the same size.

Bicycle Rim Width Compatibility Tool

Check that the tire fits your rim width.

Bicycle Frame Clearance Calculator

Check that a tire fits in your frame.

Bicycle Computer Circumference Calculator

Set your bike computer with the right wheel size.

Bicycle Tube Size Finder

Find the tube that fits your tire.

Bicycle Hookless Compatibility Checker

Check that a tire is safe on a hookless rim.

Tread Depth Unit Converter

Switch tread depth between mm and 32nds.

Tread Wear Diameter Calculator

See how worn tread makes the tire shorter.

New vs Worn Tire Circumference Calculator

Compare a new tire with a worn one.

Tire Size Chart Generator

Make a chart for the sizes you pick.

Tire Diameter Ranking Tool

Sort sizes from short to tall.

Side-by-Side Tire Visualizer

Draw two tires side by side to scale.

Tire Overlay Visualizer

Draw one tire on top of the other.

Wheel Offset Visualizer

Draw how a new offset moves the wheel.

Batch Tire Size Calculator

Work out many sizes at once.

Tire Size Formula Explainer

See each step of the math for a size.

Tire Fitment Checklist Generator

Make a list of what to check before you buy.

Printable Tire Size Reference Generator

Make a size chart you can print.

Tire Size Report Generator

Save a report that compares your sizes.