225/70R16
Overall diameter 721.4 mm
225/70R16 — 721.4 mm tall, and what it swaps with
225/70R16 is 225 mm wide with a 70% sidewall on a 16-inch wheel. That sidewall is 157.5 mm, so the tyre stands 721.4 mm tall and turns 441.2 times per kilometre.
- Section width
- 225 mm
- Aspect ratio
- 70 %
- Wheel size
- 16 in (406.4 mm)
- Sidewall height
- 157.5 mm
- Overall diameter
- 721.4 mm (28.4 in)
- Circumference
- 2266.3 mm
- Turns per km
- 441.2
Sizes you can swap to
Only sizes whose overall diameter stays within 3% are listed. A different diameter covers a different distance per turn, and that gap becomes speedometer error.
315/30R21722.4 mm · +0.14% you go faster265/40R20720 mm · -0.19% you go slower235/45R20719.5 mm · -0.26% you go slower265/35R21718.9 mm · -0.35% you go slower225/65R17724.3 mm · +0.4% you go faster265/30R22717.8 mm · -0.5% you go slower235/50R19717.6 mm · -0.53% you go slower275/35R21725.9 mm · +0.62% you go faster305/30R21716.4 mm · -0.69% you go slower315/25R22716.3 mm · -0.71% you go slower235/55R18715.7 mm · -0.79% you go slower225/60R18727.2 mm · +0.8% you go faster
Same profile, different width
Other sizes for this wheel
16-inch wheels
195/45R16 581.9mm195/50R16 601.4mm195/55R16 620.9mm195/60R16 640.4mm205/45R16 590.9mm205/50R16 611.4mm205/55R16 631.9mm205/60R16 652.4mm205/65R16 672.9mm215/55R16 642.9mm215/60R16 664.4mm215/65R16 685.9mm215/70R16 707.4mm225/50R16 631.4mm225/55R16 653.9mm225/60R16 676.4mm225/65R16 698.9mm225/70R16 721.4mm235/60R16 688.4mm235/70R16 735.4mm245/70R16 749.4mm265/70R16 777.4mm265/75R16 803.9mm
How the code reads
The 205 is millimetres, the 55 is a percentage of that width, and only the 16 is inches. The R stands for radial construction.
How to read this
- The first three digits are the width in mm, the middle two are the aspect ratio in percent, the last two the wheel in inches.
- Sidewall height = width × aspect ÷ 100. For 205/55 that is 112.75 mm.
- Overall diameter = wheel diameter + twice the sidewall. A 16-inch wheel is 406.4 mm.
- Once the diameter shifts by more than 3%, the speedometer and odometer drift by the same amount.
Frequently asked questions
Q. What is the overall diameter of 225/70R16?
721.4 mm — the 406.4 mm wheel plus the 157.5 mm sidewall at top and bottom.
Q. How many turns per kilometre does 225/70R16 make?
Its circumference is 2266.3 mm, so 441.2 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 315/30R21 at 722.4 mm.
Q. Why is the sidewall 157.5 mm?
Because it is 70% of the 225 mm width. The aspect ratio is a proportion of the width, not a length.