Search or filter by rim size — metric & flotation sizes both included
Filter by Rim
Not sure if this tire size fits? Use our Tire Size Calculator to check instantly.
Tire Size
Overall Dia.
Width
Sidewall
Circumference
Revs/Mile
Revs/Km
For reference only. Always verify fitment with a professional before purchasing tires.
Need to compare two tire sizes? Try our Tire Size Comparison for accurate results.
How to Read a Tire Size
A tire size such as 225/65R17 looks like a code, but each part tells you something useful.
The first number is the tire’s section width in millimeters, measured sidewall to sidewall.
The second number is the aspect ratio — the sidewall height shown as a percentage of that width,
so a lower number means a shorter, sportier sidewall. The letter R simply confirms the tire uses
radial construction, which is standard on almost every tire sold today. The final number is the
rim diameter in inches, and it must match your wheel exactly — this is the one measurement that
has zero room for rounding. Once you know these four values, you can calculate the tire’s actual sidewall
height, overall diameter, and circumference, which is exactly what the breakdown below does for you.
225
Section Width
Width in mm, sidewall to sidewall. 225 mm ≈ 8.9″
65
Aspect Ratio
Sidewall height as % of width. Lower = sportier.
R
Radial
Plies run radially at 90°. Standard on all modern tires.
17
Rim Diameter
Wheel size in inches. Must match exactly.
↕
Sidewall = 146.25 mm
225 mm×65%=146.25 mm (5.8″)
●
Diameter = 724.3 mm (28.5″)
(146.25 × 2 ÷ 25.4)+17=28.5 inches
⟳
Circumference = 2275.5 mm (89.6″)
28.5″×π=89.6 inches
Need to convert tire sizes? Use our free Tire Size Converter for fast and accurate results.
Frequently Asked Questions
Common questions about tire sizes and specifications
What is a tire size chart used for?
A tire size chart helps you compare tire dimensions — overall diameter, width, sidewall height, and circumference — across different sizes so you can find a compatible replacement tire or check fitment before buying. Instead of guessing whether a new size will fit, you can look up the exact measurements side by side and confirm it matches your vehicle’s requirements.
What’s the difference between metric and flotation tire sizes?
Metric sizes (like 265/70R17) show width in millimeters, aspect ratio as a percentage, and rim diameter in inches. Flotation sizes (like 33X12.50R15) show overall diameter and width directly in inches, followed by the rim size. Flotation sizing is most common on light trucks, Jeeps, and off-road tires, while metric sizing is standard on most passenger cars and SUVs.
How do I read a metric tire size like 225/65R17?
225 is the tire’s width in millimeters, measured sidewall to sidewall. 65 is the aspect ratio — the sidewall height as a percentage of the width. R stands for radial construction, and 17 is the wheel rim diameter in inches. Reading these three numbers together tells you exactly what size tire you’re working with.
How do I read a flotation tire size like 35X12.50R17?
35 is the tire’s overall diameter in inches, 12.50 is the tire’s width in inches, and 17 is the wheel rim diameter in inches. Unlike metric sizing, flotation sizes give you the actual overall diameter up front, which makes it easy to picture how tall the tire will stand once it’s mounted.
Can I convert a metric tire size to a flotation size?
Yes. Since both sizing systems describe the same physical measurements — diameter, width, and rim size — you can match a metric tire to its closest flotation equivalent by comparing those values directly. Use the chart above to search either format and line up the overall diameter and width to find the matching size in the other system.
Why does tire size matter for revolutions per mile?
A tire’s revolutions per mile (or per km) is based on its overall circumference — a larger tire covers more ground per rotation, so it turns fewer times over the same distance. This directly affects speedometer accuracy, odometer readings, and fuel efficiency if you switch to a different tire size than your vehicle originally came with.
How much can I change my tire size without affecting my vehicle?
Most manufacturers recommend staying within about 3% of your original tire’s overall diameter to avoid speedometer errors, clearance issues, or added strain on the drivetrain. Going beyond that range can also affect ABS sensor readings and how your gearing performs. Always compare the exact diameter difference using the chart above before making a change.
What rim sizes does this tire size chart cover?
The chart covers rim sizes from 12 inches up to 30 inches, including half-sizes like 16.5 and 19.5, across both metric and flotation tire types. You can use the rim filter buttons above the chart to instantly narrow the list down to just your wheel size.
Is this tire size chart accurate for all vehicles?
The chart provides standard calculated tire dimensions for reference, based on how tire sizes are measured across the industry. Always confirm the exact tire size recommended by your vehicle manufacturer, owner’s manual, or a tire professional before purchasing, since individual tire models can vary slightly from the calculated figures.
Can I search for a specific tire size on this chart?
Yes, you can type any tire size — metric or flotation — into the search bar above the chart to instantly filter and find its exact measurements. You can also use the rim filter buttons to browse by wheel size without typing anything.