Tire finder
What tires fit my vehicle?
Enter a VIN, pick your vehicle, or type the size off your door jamb placard. We work out the overall diameter, tell you what it does to your speedometer, and show what we have in stock that will actually fit.
A VIN tells us exactly which vehicle you have. It does not carry the tire size, so we pair it with the sizes that generation left the factory on, then show what we stock that fits.
No VIN handy? Pick the vehicle instead. Same result, one step less precise on trim.
The surest route. Read the size off the placard in your driver door jamb, or off the sidewall of a tire that is on the vehicle now.
How this works
Three inputs, and one of them is the honest one
Each route gets you to the same place with a different level of certainty. It is worth knowing which one you are using.
Identifies the vehicle exactly
Decoded through the official NHTSA database. Gives us year, make, model, trim, drive type and weight class. It does not contain the tire size, so we pair it with factory fitment data.
Same answer, less trim detail
Pick year, make and model. Quicker than finding a VIN, and close enough for most vehicles, but trim and package do move factory tire size.
The authoritative route
The size on your driver door jamb is what the vehicle was engineered around. Enter it and no assumption is involved at any point.
A person, at no cost
Send the year, make, model, trim and what is on it now, and we will confirm it by hand and tell you what a size change would actually take.
The maths
What we calculate, and why it matters
Overall diameter is the number that decides almost everything. It sets your effective gearing, your speedometer reading, and whether the tire clears the fender at full lock and under compression. Tire sizes do not state it, so we work it out.
For a metric size the sidewall height is the section width multiplied by the aspect ratio, so 275/60R20 has a sidewall of 275 x 0.60, which is 165mm or 6.5 inches. Two sidewalls plus the 20 inch wheel gives 33 inches overall. Flotation sizes state it directly: 35x12.50R20 is 35 inches tall.
From there the comparison is simple arithmetic, and it is the same arithmetic printed on every tire listing on this site, so the finder and the product pages never disagree.
| Change in diameter | What it means |
|---|---|
| Within 3% | Direct replacement, nothing to change |
| 3% to 5% | Speedometer reads low, usually a leveling kit |
| 5% to 8% | Leveling kit plus trimming on most trucks |
| Over 8% | Real lift, and often a re-gear to drive properly |
Percentages are a guide. Clearance depends on offset, suspension and body, which is why we still check the order before it ships.
Questions
About the finder, and about sizing
Does a VIN tell you my tire size?
No, and anyone who says otherwise is guessing. A VIN encodes the year, make, model, trim, drive type and weight class, and we decode all of that through the official NHTSA database. It does not encode the tire size, because the same vehicle leaves the factory on several different sizes depending on trim and package. What we do is identify your vehicle from the VIN, then show the sizes that generation commonly shipped on, then show what we stock against them.
Where do I find the size my vehicle was actually built for?
The placard in your driver door jamb. It lists the original tire size and, more importantly, the load index and inflation pressure the vehicle was engineered around. That placard is the authority, and if what is on your vehicle now disagrees with it, somebody changed the size at some point. Enter the placard size on the third tab for the most accurate answer this tool can give.
What does the percentage next to each size mean?
How much taller or shorter that tire is than your reference size, measured on overall diameter. Inside about 3 percent your speedometer and odometer stay close enough to correct that nothing needs recalibrating and your transmission shifts near its calibration. Outside that window your speedometer reads low when the tire is taller, and on all wheel drive vehicles a diameter mismatch between axles makes the driveline absorb a permanent speed difference.
Why does the rim diameter never change in the results?
Because it cannot. The last number in a tire size is the wheel it mounts on, and it has to match your wheel exactly. Everything else in a tire size is a clearance and load question. If you want a different wheel diameter you are buying wheels as well as tires, which is what our wheel and tire packages are for.
Can I just fit the biggest tire that clears?
You can fit anything that physically clears, but clearing is not the same as being right. Going taller raises the centre of gravity, slows the effective gearing, adds unsprung and rotating weight, and on a truck can put you under the load rating your placard calls for if you drop to a passenger construction tire. Bigger also usually means a leveling kit at one size up, trimming beyond that, and a real lift past 35 inches. Tell us what you are trying to achieve and we will tell you the cheapest honest way to get there.
What if my vehicle is not in your list?
Use the tire size tab. Read the size off your door placard or the sidewall of a tire currently on the vehicle, and the tool works from there without needing to know the vehicle at all. You can also send us the year, make, model and trim and we will confirm it by hand.
Not sure the tool got it right?
Send us the year, make, model, trim and what is on the vehicle now. We will confirm it by hand before you spend anything.