Tire Size Chart | Tire Size Calculator

Tire size chart

Catalog sizes with diameter, width and sidewall. Sorted by stamp.

Recommended Tire Care & Emergency Gear

Protect your tire investment, prevent uneven tread wear, and stay prepared for highway roadside emergencies.

Driver Equipment

Roadside Power Roadside Must

NOCO Boost Plus GB40 1000A 12V Lithium Jump Starter

Ultra-compact 1000-amp lithium jump starter rated for gasoline engines up to 6 liters and diesels up to 3 liters. Delivers up to 20 jump starts per charge with spark-proof technology and reverse polarity safety protection.

Revives dead vehicle batteries instantly without needing a second jump car

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Emergency Air Pro Compressor

Heavy-Duty 12V Metal Cylinder Portable Tire Inflator

High-output direct battery clamp air compressor delivering up to 120 PSI. Inflates standard passenger tires and oversized SUV/truck tires (up to 33 inches) in minutes with thermal overload cutoff protection.

Eliminates roadside strandings and avoids coin-operated gas station air pumps

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Wheel Service Torque Spec

LEXIVON 1/2-Inch Drive Click Torque Wrench (10-150 ft-lb)

Pre-calibrated reversible click-stop torque wrench with electro-black finish and dual-range highlighted scale. Ensures wheel lug nuts are tightened to exact manufacturer torque specifications.

Prevents warped brake rotors, broken wheel studs, and loose lug nuts

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Pressure Calibration Driver Essential

AstroAI Heavy-Duty Digital Tire Inflator Gauge (250 PSI)

Commercial pistol-grip inflator gauge with backlit LCD, heavy-duty brass air chuck, and quick-disconnect bleeder valve. Delivers precise 0.1 PSI resolution for exact cold-pressure balancing.

Maximizes tire contact patch, fuel efficiency, and tread longevity

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Puncture Repair Flat Defense

Boulder Tools Heavy-Duty All-Metal Tire Plug Repair Kit

Heavy solid steel T-handle spiral reamer and split-eye insertion needle with self-vulcanizing rubber repair strings. Plugs nail punctures and screw holes in steel-belted radial tires without demounting wheels.

Permanently seals tread punctures on the shoulder in under 10 minutes

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Safety Inspection Wear Inspector

Digital Tire Tread Depth Gauge with Backlit LCD Screen

High-precision hardened probe gauge measuring remaining rubber depth in 32nds of an inch and millimeters. Features one-touch zero tare to detect early suspension camber wear.

Alerts you before tread wears past the critical 4/32" wet hydroplane threshold

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Tire Maintenance & Wheel Service Matrix

Standard vehicle maintenance intervals to maximize tread lifespan, fuel economy, and highway braking stability.

Service Task	Recommended Equipment	Service Interval	Vehicle Safety & Handling Impact
Cold Pressure Calibration	Digital Inflator Gauge (0.1 PSI resolution)	Monthly or before highway road trips	Maintains uniform footprint, avoids edge-shoulder wear, and saves fuel.
Lug Nut Torque Verification	1/2-Inch Drive Click Torque Wrench	Every tire rotation or 50 miles after wheel installation	Eliminates wheel wobble, sheared wheel studs, and warped brake discs.
Tread Depth Inspection	Digital Tread Depth Gauge	Every 3,000 miles across all 4 tires	Catches toe or camber alignment issues before tires fail wet braking tests.
Roadside Puncture Sealing	T-Handle Vulcanizing Plug Kit	On-demand when encountering road debris	Seals nail punctures in the tread crown without waiting for roadside tow trucks.
Mobile Air Delivery	12V Battery-Clamp Air Compressor	Pre-trip safety and roadside emergency inflation	Re-inflates low tires after slow bead leaks or temperature drops.
Emergency Powertrain Start	1000A Lithium Jump Pack	Vehicle emergency glovebox standby	Provides standalone cranking amps during cold morning battery drains.

Mechanic Tip

Cold Inflation Calibration Rule: Tire pressure drops roughly 1 PSI for every 10 degrees Fahrenheit drop in ambient temperature. Furthermore, driving even 1 mile generates internal friction that raises tire pressure by 3 to 5 PSI above true ambient resting level. Never set your tire pressure to the "Max PSI" molded on the tire sidewall, which indicates the maximum mechanical burst rating of the casing. Always calibrate tire pressure when the vehicle has rested for at least 3 hours, matching the cold PSI specified on the yellow-and-white driver-side door jamb placard.

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This tire size chart lists every size in the catalog with overall diameter, section width, sidewall and rim. It is a lookup, not a shopping list. Click a stamp for the converter page, or use the tire size calculator if the size is not in the table. The tire diameter chart is the same data sorted by height.

How to use the chart

Find the stamp you have, read the diameter, then scan for neighbours with a similar height. A swap inside about 3% diameter is the usual first filter for speedometer error and well clearance. Width is the second filter: a much wider tire needs a wider wheel and more room in the well.

Volumes in the research that built this site sit on truck and SUV sizes (275/65R20, 285/70R17, 315/70R17). Passenger-car sizes are here only when they sit next to those. If you need a sedan size, type it into the calculator. The arithmetic is the same.

Catalog tire size chart. Diameter and width are calculated from the stamp.
Size	Diameter	Width	Sidewall	Rim
225/75R15	28.3″	8.9″	6.6″	15
235/65R17	29.0″	9.3″	6.0″	17
235/75R15	28.9″	9.3″	6.9″	15
245/70R17	30.5″	9.6″	6.8″	17
245/75R16	30.5″	9.6″	7.2″	16
255/65R17	30.1″	10.0″	6.5″	17
255/70R17	31.1″	10.0″	7.0″	17
255/70R18	32.1″	10.0″	7.0″	18
255/75R16	31.1″	10.0″	7.5″	16
255/75R17	32.1″	10.0″	7.5″	17
255/80R17	33.1″	10.0″	8.0″	17
255/85R16	33.1″	10.0″	8.5″	16
265/50R20	30.4″	10.4″	5.2″	20
265/60R20	32.5″	10.4″	6.3″	20
265/65R17	30.6″	10.4″	6.8″	17
265/65R18	31.6″	10.4″	6.8″	18
265/70R17	31.6″	10.4″	7.3″	17
265/70R18	32.6″	10.4″	7.3″	18
265/75R16	31.6″	10.4″	7.8″	16
265/75R17	32.6″	10.4″	7.8″	17
265/80R17	33.7″	10.4″	8.3″	17
275/50R20	30.8″	10.8″	5.4″	20
275/55R20	31.9″	10.8″	6.0″	20
275/60R20	33.0″	10.8″	6.5″	20
275/65R17	31.1″	10.8″	7.0″	17
275/65R18	32.1″	10.8″	7.0″	18
275/65R20	34.1″	10.8″	7.0″	20
275/70R17	32.2″	10.8″	7.6″	17
275/70R18	33.2″	10.8″	7.6″	18
275/75R16	32.2″	10.8″	8.1″	16
275/75R17	33.2″	10.8″	8.1″	17
275/80R17	34.3″	10.8″	8.7″	17
285/55R20	32.3″	11.2″	6.2″	20
285/60R20	33.5″	11.2″	6.7″	20
285/65R17	31.6″	11.2″	7.3″	17
285/65R18	32.6″	11.2″	7.3″	18
285/65R20	34.6″	11.2″	7.3″	20
285/70R16	31.7″	11.2″	7.9″	16
285/70R17	32.7″	11.2″	7.9″	17
285/75R16	32.8″	11.2″	8.4″	16
285/75R17	33.8″	11.2″	8.4″	17
285/75R18	34.8″	11.2″	8.4″	18
295/55R20	32.8″	11.6″	6.4″	20
295/60R20	33.9″	11.6″	7.0″	20
295/65R20	35.1″	11.6″	7.5″	20
295/70R17	33.3″	11.6″	8.1″	17
295/75R16	33.4″	11.6″	8.7″	16
295/75R17	34.4″	11.6″	8.7″	17
305/55R20	33.2″	12.0″	6.6″	20
305/70R16	32.8″	12.0″	8.4″	16
305/70R17	33.8″	12.0″	8.4″	17
305/75R16	34.0″	12.0″	9.0″	16
315/70R17	34.4″	12.4″	8.7″	17
315/75R16	34.6″	12.4″	9.3″	16
31x10.50R15	31.0″	10.5″	8.0″	15
325/75R16	35.2″	12.8″	9.6″	16
33x12.50R15	33.0″	12.5″	9.0″	15
33x12.50R17	33.0″	12.5″	8.0″	17
33x12.50R18	33.0″	12.5″	7.5″	18
33x12.50R20	33.0″	12.5″	6.5″	20
35x12.50R17	35.0″	12.5″	9.0″	17
35x12.50R18	35.0″	12.5″	8.5″	18
35x12.50R20	35.0″	12.5″	7.5″	20
37x12.50R17	37.0″	12.5″	10.0″	17

Chart vs comparison

A chart answers "how tall is this stamp." A comparison answers "what happens if I change it." Use the tire size comparison when you have two candidates. Use this page when you are still picking the second stamp.

Load range is not on this chart

E-load and C-load versions of the same stamp share a diameter and do not share a capacity. The load index page is that table. Do not buy off height alone.

Frequently asked questions

Is this every tire size?

No. It is the catalog this site built pages for: the high-volume truck and SUV stamps plus the flotation sizes people compare them to. Any other stamp still works in the calculator.

Why do two sizes share a diameter?

Different width and aspect combinations can land on the same height. That is how plus sizing works, and why a 33x12.50 and a metric 285/70 can be in the same conversation.