Tire Size Chart (Tire Sizes, Conversions & Fitment Tips)
A tire size chart helps you match tire sizes (like P215/60R16) to key measurements—section width, aspect ratio, rim diameter, sidewall height, and overall diameter—so you can replace tires confidently or compare options. It also helps with tire size conversion (metric ↔ inches) and prevents clearance or speedometer problems.
If you searched for “tire size chart,” you likely want a fast and correct answer. Start by reading your tire’s sidewall code, confirm the rim diameter, then use a chart (and a quick comparison check) to make sure the overall diameter stays reasonable for your vehicle. This guide explains everything in simple steps.
Tire size chart basics: what the numbers mean
Most tires in the USA use P-metric sizing. A common example is:
P215/60R16 94V
Here’s what each part means:
P = Passenger tire (most cars and SUVs)
215 = Section width in millimeters (how wide the tire is)
60 = Aspect ratio (sidewall height as a percentage of width)
R = Radial construction (standard for modern tires)
16 = Rim/Wheel diameter in inches (must match your wheel)
94 = Load index (how much weight the tire can carry)
V = Speed rating (maximum safe speed capability)
P vs LT vs “no prefix” (important difference)
P = Passenger tires (cars, crossovers, most SUVs)
LT = Light Truck tires (towing, hauling, off-road use)
No prefix = Standard metric sizing (read the same way)
Rule of thumb: If your door sticker says LT, do not replace with P-metric tires.
Quick tire size chart (common sizes by rim diameter)
15-inch rims
195/65R15
205/65R15
215/65R15
16-inch rims
205/55R16
215/60R16
225/60R16
17-inch rims
225/65R17
235/65R17
245/65R17
18-inch rims
235/60R18
255/55R18
265/60R18
19–20-inch rims
255/50R19
275/45R20
275/40R20
How to use this chart (3 steps)
Find your rim size (15, 16, 17, etc.)
Look for sizes close to your current tire
If changing size, compare overall diameter (next section)
Tire size calculator measurements (what matters most)
When comparing tire sizes, focus on these five measurements:
Section width
Sidewall height
Overall diameter
Circumference
Revolutions per mile (revs/mile)
Why overall diameter the most important
Changingthe overall diameter can:
Cause rubbing on fenders or suspension
Make your speedometer inaccurate
Change fuel economy and gearing feel
If you plan to change tire size, use a tire size calculator to compare diameter and revs/mile.
Tire size conversion: metric to inches (simple formulas)
For P215/60R16:
Width (inches) = 215 ÷ 25.4
Sidewall height (mm) = 215 × 0.60
Sidewall height (inches) = (215 × 0.60) ÷ 25.4
Overall diameter (inches) = 16 + (2 × sidewall inches)
If you don’t want to do math, a tire size calculator can do this instantly.
Flotation (inch) tire sizes (off-road format)
Example: 33×12.50R17
33 = Overall diameter (inches)
12.50 = Tire width (inches)
17 = Rim diameter (inches)
Fitment & safety checklist (before changing tire sizes)
Step 1 — Match rim diameter
Your new tire must fit your wheel size (16” tire for 16” rim, etc.).
Step 2 — Check load index
Lower load index means lower weight capacity.
If you tow or haul, never downgrade this.
Step 3 — Check speed rating
Match or exceed your vehicle’s required rating.
Step 4 — Compare overall diameter
Use a calculator to avoid rubbing and speedometer errors.
Step 5 — Check wheel width compatibility
Even if the diameter fits, the wheel width must be suitable for the tire.
Step 6 — Follow your door placard
Your driver-side door sticker is the manufacturer’s recommendation.
DOT date code: how to check tire age (10 seconds)
Look for the DOT code on your tire sidewall.
The last four digits = week + year manufactured.
Example:
2623 = 26th week of 2023
Always check this when buying new tires.
Common tire size chart mistakes (and how to avoid them)
Mistake: Confusing rim size with tire size
Fix: The “16” in P215/60R16 is your wheel size, not total tire height.
Mistake: Ignoring load index
Fix: Always match or exceed your vehicle’s requirement.
Mistake: Choosing tires just for looks
Fix: Check clearance and overall diameter first.
Mistake: Relying on rough estimates
Fix: Use a tire size calculator for accuracy.
Quick takeaways
Read your tire sidewall first
Match rim diameter
Compare the overall diameter before changing sizes
Verify load index and speed rating
Check the DOT date code before buying
FAQ
What do the numbers on a tire mean?
They show tire width, sidewall height, construction type, and rim size, plus load and speed rating.
Where do I find my tire size?
On the tire sidewall and your driver’s door placard.
Can I change my tire size?
Yes, but compare the overall diameter and verify load and speed ratings.
How do I convert tire sizes to inches?
Divide millimeters by 25.4 and calculate the overall diameter using the formula above.
How do I read the DOT date code?
The last four digits show the week and year the tire was made.
